View source for Signalling Guide/Interlocking Version

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{{For|the current (Pre V2.0) Signalling Guide|Signalling Guide}}
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Signalling is one of the most important parts of the railway and the game. It exists to ensure the safety of people, trains, and the surrounding infrastructure. For the most part, this is ensured by having ''one train, in one section, at one time.''  

This guide will cover the majority of information needed to learn signalling in Dovedale. Beforehand it is essential that you have read the [[Signals]] and [[Signs]] pages so that you have sufficient knowledge of topics that are covered in this guide.

== An Introduction to Signalling == 

{{GuideSection
|border_color=lightblue
|section_id=1.1
|section_title=The History
|content=
[[File:Opening Liverpool and Manchester Railway.jpg|A lithograph of the Liverpool and Manchester Railway during its opening.|right|350px]]
Railways in a modern sense started in 1830 with the Liverpool and Manchester Railway. At first there was little need for signals or signalling; trains were rare and travelled at low speeds. However, by the 1840s, a number of accidents occurred, which prompted the introduction of the first railway signalling systems. 

The first major innovation was time interval working, and was introduced to prevent accidents on the railway alongside fixed signals or hand signallers. The principles of this operation were: 

* Only let a train pass a certain point every 5 or 10 minutes.
* If a train was struggling a bit, maybe give it a bit longer.

Whilst this was an improvement on the old regime, time interval working was fatally flawed. If a train broke down or came across an obstruction, the next train could crash into it. 

Prompted again by more accidents, it became clear that a ''space interval'' rather than a ''time interval'' was required, and thus by the 1850s, the foundation of all modern signalling - Absolute block - was created.
}}

{{GuideSection
|border_color=lightblue
|section_id=1.2
|section_title=The Basics: Block Signalling
|content=
Block signalling is the first principle of all modern signalling systems; the general principle being that there should only be ''one train, in one section, at one time,'' with few exceptions. 

Absolute block came as a result of incidents in the time interval system in the 1850s. It was made mandatory for all railways in 1889 and forms the basis of all modern railway signalling. In fact, there are still many signal boxes working under this methodology today. 

In principle:

* There are signal boxes at regular intervals along a line controlling points and signals.
* Only one train is allowed in a section between these boxes at any one time.
* Signal boxes communicate with each other through the use of block instruments and bell signals.
}}

== Signal Box Equipment==

{{GuideSection
|border_color=crimson
|section_id=2.1
|section_title=Lever Frame
|content=
[[File:Lever_Diagram_Thing.png|center|frameless|434x434px]]
The lever frame is perhaps the most important part of a mechanical [[List of Signal Boxes|signal box]], controlling most of the signalling infrastructure in the surrounding area. Attached to each lever is a plate with the lever's number, description, and a list of the other levers which must be reversed prior to reversing the lever.

When a lever is in the frame/pointing away from you, it is referred to as being in the "normal" position. If a lever is out of the frame/pointing towards you, it is in the "reversed" position.

Some levers have shortened handles. For signal levers, this indicates that a mechanically operated signal has been replaced with an electrically operated semaphore or colour light signal. For white/blue FPL levers, this indicates that the FPL has been motorised and disconnected from the lever, but the lever still operates the interlocking mechanism and must be used as if it were a functional FPL.

Levers are coloured to help you identify their function at a glance. A white stripe in the centre of a signal lever indicates that it is electronically released by another signal box. Please note, in some cases these differ from real life standards. The colours currently in use are as follows:  
<!-- the pipe characters in the table are escaped since it is inside a template parameter declaration -->
{{{!}} class="mw-collapsible mw-collapsed wikitable"
!'''Colour'''
! '''Description'''
{{!}}-
{{!}}<span style="color: #e01e04;;">'''Red'''</span>
{{!}}Controls all stop signals and shunt signals. When the lever is normal, the signal displays a danger aspect. When reversed, the signal displays a clear aspect. Note there are some exceptions.
{{!}}-
{{!}}<span style="color: #fad711;">'''Yellow'''</span>
{{!}}Controls distant signals. When the lever is normal, the signal displays a caution aspect. When reversed, the signal displays a clear aspect.
{{!}}-
{{!}}<span style="color: #ffa352;;">'''Red and Yellow'''</span>
{{!}}Controls an intermediate block signal, consisting of both a stop signal and a distant signal.
{{!}}-
{{!}}<span style="color: #2f24ff;">'''Blue'''</span>
{{!}}Controls facing point locks (FPLs). In the normal position, the corresponding points are unlocked. In the reversed position, the points are locked. Before allowing a facing move over any points, they must be locked with this lever.
{{!}}-
{{!}}<span style="color: #000000;">'''Black'''</span> 
{{!}}Controls points. With the lever in the normal position, the points are in the position shown on the signalling diagram. Reversing the lever reverses the points. Points cannot be moved if the corresponding FPL is locked (reversed).
{{!}}-
{{!}}<span style="color: #1a0252;">'''Blue and Black'''</span>
{{!}}Controls electrically operated combined points and FPLs. The FPL will be locked automatically in both lever positions.
{{!}}-
{{!}}<span style="color: #82c1ff;">'''White and Blue'''</span>
{{!}}Spare levers previously connected to a facing point lock which have been replaced with electrically operated points. These levers still act as FPLs for interlocking purposes.
{{!}}-
{{!}}<span style="color: #815137;">'''Brown'''</span>
{{!}}Controls manual level crossings. 
{{!}}-
{{!}}<span style="color: white;">'''White'''</span>
{{!}}Spare levers. These do not control anything and are not in use.
{{!}}-
{{!}}}
}}

{{GuideSection
|border_color=crimson
|section_id=2.2
|section_title=Block Shelf
|content=
IMAGE PLACEHOLDER 

The block shelf is positioned directly above the lever frame and serves as a mounting point for signalling equipment to be easily seen and worked by a signaller. It is named such as the block instruments and bells used by Absolute Block and Tokenless Block is mounted here. (See 3.2, 5.2) Equipment mounted to the block shelf includes:

* Block Indicators and Bells (AB and TLB)
* Electrical Release Plungers
* Line Clear Release Indicators
* Signal and Points Indicators
* Track Circuits and Depression Bar Indicators

}}

{{GuideSection
|border_color=crimson
|section_id=2.3
|section_title=Track Layout Diagrams
|content=
Every signal box contains a large diagram displaying the layout of tracks controlled by the box and information.

WIP

IMAGE PLACEHOLDER 

}}

{{GuideSection
|border_color=crimson
|section_id=2.4
|section_title=Electrical Release Plungers & Line Clear Indicators
|content=
'''Electrical Release Plungers'''

Some signal levers have an electric lock plunger connected to them; you will need to press the plunger with the corresponding number before pulling the lever. You do not need to press the plunger to move the lever back to the normal position. Plungers are installed for signals under the following circumstances:

*Section signal requiring line clear release
*Signal protecting a level crossing
*Signal with several routes
*Subsidiary signal interlocked with track circuit

[[File:Electric Plunger.png|500px|left]]

'''Line Clear Indicators'''

These indicators light up when the corresponding block instrument displays 'Line Clear' (Absolute block) or 'Train accepted' (Tokenless Block). They are installed if section signals requiring line clear release are located far from the corresponding block instrument, such that a signaller is informed when line clear has been given by the other box, allowing them to clear their section signal.

[[File:Line Clear Indicator.png|150px|center]]

}}

{{GuideSection
|border_color=crimson
|section_id=2.5
|section_title=Signal and Points Indicators
|content=
[[File:V2.0signal&pointsindicators.png|500px|center]]
All signal boxes contain indicators which display the aspect/position of each signal and set of points controlled by the signal box. This allows the signaller to ensure that signals and points are in the correct position after moving a lever. Some signals are not provided with indicators as they are in direct sight of the signaller.

Mechanically operated signals and points are connected to indicator dials with three positions. For signals, the positions are: 'On' (danger/caution aspect), 'Wrong' and 'Off' (clear aspect). For points: 'Normal', 'Wrong' and 'Reverse'.

Electrically operated signals and points are connected to small indicator boxes. Signal indicators will show a small coloured light representing the aspect shown on the signal. Points indicators will display 'N' or 'R' representing Normal and Reverse respectively.

Note that if an indicator displays 'Wrong' or does not change state, this means your player has not loaded the physical signal.

}}

{{GuideSection
|border_color=crimson
|section_id=2.6
|section_title=Track Circuits
|content=
[[File : MS track circuits.png | 500px|center]] 
In all signal boxes aside from [[Benyhone Loop Signal Box]], the track layout diagram includes numerous pairs of lights, which show the location of trains without the signaller having to look for them. This is particularly useful in signal boxes that lack line of sight with certain areas, as signallers can tell which signals a train a has passed.

Aside from being located on the diagram, some track circuit indicators may be attached to or placed on the block shelf, named with the pertaining location or line. An example of one style can be seen below.
[[File:Track circuit new.png|500px|center]]

}}

{{GuideSection
|border_color=crimson
|section_id=2.7
|section_title=Barrier Pedestals & Gate Wheels
|content=
In most signal boxes, manually controlled level crossings are operated by a barrier pedestal. The barrier pedestal has two interactable buttons: "Barriers Lower" and "Barriers Raise".

Some crossings have "On-call" functionality; these can be kept down until a road user presses a plunger which activates an annunciator on the level crossing control. You then may raise the level crossing. After 3-5 minutes or when needed, the level crossing can then be lowered.

Before you can clear any signals over the crossing, you must:

#Check the crossing for approaching vehicles or obstructions.
#Press the "Barriers Lower" button.
#Observe the barriers lowering, preparing to stop the lowering procedure if any obstructions enter the crossing.
#Once the barriers have finished lowering, visually check the crossing for obstructions in a "figure of 8" motion.

After all trains have passed and it is safe to do so, you should raise the barriers.

[[Marigot Crossing Signal Box]] is fitted with a gate wheel. The same procedure should be followed, however the gates are operated through the "R" and "F" keys on your keyboard, and the "Gate Stops" and "Gate Locks" levers must both be normal to move the gates.

[[File:V2.0 barrier pedestal.png|left|frameless]]
[[File:V2.0_Gate_Wheel.png|right|frameless]]
}}

{{GuideSection
|border_color=crimson
|section_id=2.8
|section_title=WIP
|content=
WIP

IMAGE PLACEHOLDER 
}}

==Absolute Block Signalling ==

{{GuideSection
|border_color=#e09f00
|section_id=3.1
|section_title=The Principles of Absolute Block 
|content=
[[File:Block Section Diagram.jpg|right|frameless|357x357px]]Absolute Block splits each line between signal boxes into a block section. A block section expands from the last stop signal of one signal box, to the first stop signal of the next signal box. Only one train is allowed within each block section at one time.

Before a signaller can clear a train into a block section, the next signal box must give permission for a train to approach. Signallers do this through the use of block instruments and bell signals.
[[File:Block Section Diagram 2.jpg|frameless|430x430px]]
}}

{{GuideSection
|border_color=#e09f00
|section_id=3.2
|section_title=Block Instruments
|content=
[[File:Block Instrument Diagram.png|centre|frameless|363x363px]]Block instruments provide a continuous reminder of the state of the section between two signal boxes. Above is a diagram of a standard BR "penguin" block instrument. From top to bottom, all block instruments consist of:  

*A repeater indicator, controlled by the next signal box, which shows the state of the line towards the next signal box.
*A master indicator, controlled by you, which shows the state of the line towards your box. This is repeated in the next signal box's repeater indicator.
*A commutator, which is used to change the position of your master indicator.
*A bell unit, used to send and receive bell signals between signal boxes.

Some block instruments may look different to this standard one, and may be split up into different parts, but they all fundamentally work the same.

Block instruments have three states. From the perspective of the master indicator/your commutator position, these are:  

*'''Normal''' - Also known as Line Blocked or Line Closed. When there is no train occupying the block section towards your box and you have not accepted a train, your block instrument must be kept at normal.
*'''Line Clear''' - Indicates that you have given permission for the next box to allow a train into the block section towards your box.
*'''Train on Line''' - Indicates that a train is occupying the block section towards your box.

When a block instrument is used over a single line, the offering signal box '''must''' keep their commutator at '''normal''' during the offering and sending procedure.
}}

{{GuideSection
|border_color=#e09f00
|section_id=3.3
|section_title=Bell Signals
|content=
Bell signals are used to communicate between signal boxes, and are still used today in lieu of telephone communications. Bell codes have distinct advantages over verbal communication, namely: 

*'''Unambiguity''' - There is no room for errors and misinterpretation, bell codes are definitive, but conversations can be worded ambiguously.
*'''Speed''' - Bell signals are often faster than typing or speaking messages.

A list of commonly used bell codes can be found within all signal boxes, however a complete list can be found on the [[Bell Codes|bell codes]] page.

You '''must''' acknowledge all bell signals by repeating them. You must not consider any bell signal as understood until it has been correctly acknowledged.

You '''must''' send call attention (1) and have it acknowledged before you send any other bell signal, except for:

*train entering section (2)
*obstruction danger (6)
* train running away in the wrong/right direction (2-5-5/4-5-5)

In most boxes, there is more than 1 bell. To differentiate between each bell, you can click on the metal bell itself to hear the sound. This will not send a signal to the other signal box, and can only be heard by your player. A small light is also provided which will illuminate when a signal is received. 
}}

{{GuideSection
|border_color=#e09f00
|section_id=3.4
|section_title=Procedure: Offering & Sending Trains
|content=
[[File:Block_Section_Diagram_2.jpg|right|frameless|430x430px]]This section outlines the procedure for the day to day sending of trains between signal boxes.

=== Offering Trains ===
For the purposes of this example, you, signaller "A" will be signalling a train from signal box "A" to signal box "B".

When sending a train between signal boxes, you must offer it. Before you can offer a train to signaller "B", you must: 

*Check that the block instrument is at normal for the line concerned.
*Have received train out of section for the last train sent on that line.

=== To offer a train: ===
#Send call attention (1) to signal box "B".
#Once acknowledged, send the appropriate '''is line clear''' code (e.g. 3-1).
#If the line is clear, signaller B will acknowledge the is line clear and place their instrument at line clear.
#You may then clear your signals to allow a train into the block section.
#When the train passes your signal box, you must send '''train entering section''' (2) to signal box B. You must make sure signaller B places their instrument at train on line.
#Once the train arrives at signal box "B", signaller "B" will send '''train out of section''' (2-1) to you. You must acknowledge this, and make sure they replace their instrument to normal.

=== Receiving Trains ===
For the purposes of this example, you, signaller "A" will be receiving a train from signal box "B". 

#If the line is clear, you should acknowledge the '''is line clear''' and place your instrument to line clear. If it is not, you '''must not acknowledge''' the is line clear bell code.
#When you receive '''train entering section''' (2) you must acknowledge it and place your block instrument to train on line.
#Once you have received train entering section, you should offer the train onto the next signal box as shown above.
#When the has completely left the block section (most often visually confirmed by seeing the tail lamp), you must send '''call attention''' (1) to signaller B.
#You must then send '''train out of section''' (2-1) to signaller B, and only once acknowledged, place your commutator to normal.
}}

{{GuideSection
|border_color=#e09f00
|section_id=3.5
|section_title=Procedure: Opening, Closing & Testing
|content=
=== Opening a Signal Box ===
When you open your signal box you must send opening of signal box to all surrounding signal boxes.

#Send '''call attention''' (1) and await acknowledgement.
#Send '''opening of signal box''' (5-5-5) and await acknowledgement.
#Begin the testing equipment procedure.

=== Closing a Signal Box ===
When you close your signal box you must:

#Ensure that train out of section has been received for the last train in each block section, and that all block instruments are at Normal.
#Place all your signals to danger.
#Send '''call attention''' (1) and await acknowledgement.
#Send '''closing of signal box''' (7-5-5) await acknowledgement.

=== Testing Equipment ===
As soon as possible after opening, if no trains are immediately due to be signalled, you must test your bells and block indicators. 

====== Absolute Block Procedure ======
#Send '''call attention''' (1) and await acknowledgement.
# Send '''testing equipment''' (16) and await acknowledgement.
#The next signal box will then move their block instrument through the full sequence. You must acknowledge all movements with 1 beat on the bell. Before acknowledging the first movement of the block instrument to line clear, pull your starting signal (or one of your starting signals if there are multiple).
#Turn your block instrument's commutator through the full sequence of indications (line clear - train on line - normal). You must wait until you receive 1 beat on the bell before moving each indicator. 

====== Electric Token Block Procedure ======

# Send '''call attention''' (1) and await acknowledgement.
# Send '''testing equipment''' (16), making sure to have the token in the slot.
# The next signal box will hold the bell down for you to release your token.
# Once you have your token, pull your starter signal and replace it (if there are multiple starter signals, then just test one of them).
# After you have done this, hold the bell down till the next signal box has removed the token.
# Once they have completed the process, they will bell 16 back to you.
}}

{{GuideSection
|border_color=#e09f00
|section_id=3.6
|section_title=Procedure: Shunt Into Forward Section
|content=
This regulation must be used when a train needs to pass your last stop signal into the block section for shunting purposes. 
When sending shunt into forward section, you must: 

#Send '''call attention''' (1) to the next signal box and await acknowledgement.
#Send '''shunt into forward section''' (3-3-2) and await acknowledgement.
#If you can begin the shunt move, you will receive line clear on the block instrument. You may then clear your signals for the train to proceed.
#Send '''train entering section''' (2) to the next signal box. Ensure that they set their block instrument to train on line.
# Once the train has left the block section and completed shunting, you should send '''call attention''' (1), followed by '''train withdrawn''' (8) to the next signal box.

If you receive shunt into forward section you must:

#Check that no train are in the block section.
#Acknowledge '''shunt into forward section''' (3-3-2) and place your block instrument at line clear.
#When you receive '''train entering section''' (2), acknowledge it and place your block instrument at train on line.
#When you receive '''shunt withdrawn''' (8), acknowledge it and place your block instrument to normal.
}}

{{GuideSection
|border_color=#e09f00
|section_id=3.7
|section_title=Procedure: Blocking Back
|content=
This regulation must be used when you must send a train on the wrong direction for shunting purposes. If you're shunting train on the right direction, see ''shunt into forward section.''

If you are intending to send Blocking Back, you must:

# Send '''call attention''' (1) to the signal box you wish to block the home signal then await acknowledgement.
# Send '''blocking back outside home signal''' (3-3), and await acknowledgement.
# After the bell was acknowledged, turn your block instrument to ''Train On Line''.
# Perform the shunting movement. You need to come to a clear understanding with the driver before clearing relevant signals/giving verbal authority.
# After the movement has left the block section and have completed the shunting movement. You must send '''obstruction removed''' (2-1-2), and await acknowledgement. Once the other signal box acknowledged your '''obstruction removed''', you must return the block instrument to ''Normal.''

When you are receiving Blocking Back, you must:

# Understand the line to the sending signal box is blocked and you cannot send a movement toward it, then acknowledge '''blocking back outside home signal''' (3-3). 
# Wait for the shunting movement to complete. 
# Acknowledge '''obstruction removed''' (2-1-2). Check that the block instrument is at ''Normal'' before sending any new movement.

You must not acknowledge blocking back if you have allowed a movement toward the sending signal box which would conflict with the shunting movement at the sending signal box.

On a single line, you must use ''shunting train into forward section'' instead of blocking back.
}}

{{GuideSection
|border_color=#e09f00
|section_id=3.8
|section_title=Procedure: Cancelling & Train Incorrectly Described
|content=
=== Cancelling ===
If a train is not going to proceed but you have already sent is line clear or train entering section, you must: 

* Place all relevant signals to danger.
* Send call attention, followed by '''cancelling''' (3-5) to the signal box in advance.

If you receive '''cancelling''' (3-5) you must acknowledge it and place your commutator to normal.

=== Train Incorrectly Described ===
If you have sent the incorrect line clear and the signal box in advance has acknowledged it, you must: 

* Send call attention, then '''train incorrectly described''' (5-3).
* When acknowledged, send the correct is line clear.

If you receive '''train incorrectly described (5-3)''', you must acknowledge it and then acknowledge the correct is line clear. Do not move the commutator on the block instrument.
}}

{{GuideSection
|border_color=#e09f00
|section_id=3.9
|section_title=Procedure: Obstruction Danger
|content=
=== When to Send ===
You must send obstruction danger if you need to stop trains coming towards your signal box due to an obstruction or other emergency within the block section. You must immediately, and without sending call attention, send '''obstruction danger''' (6) to all relevant signal boxes.

You must send obstruction danger even if you have not received is line clear or train entering section.

You must also send obstruction danger if a train is approaching which you have not:

* Acknowledged is line clear.
* Received train entering section.
* Received train or vehicles proceeding without authority.
* Acknowledged shunt into forward section.

You do not need to send obstruction danger if you can move facing points to a line that is clear.

=== Sending Obstruction Danger ===
When sending '''obstruction danger (6)''' you must:

* Place or keep all relevant block instruments to train on line.
* Place or keep all signals at danger to protect the obstruction.

You must then tell all relevant signallers the reason for sending obstruction danger. You must then reach a clear understanding of the lines affected and which can be re-opened for trains.

If you receive '''train or vehicles proceeding without authority in the right direction (4-5-5)''' after sending obstruction danger, you must take all possible actions to stop the approaching train.

If you receive '''cancelling''' for a train which has been acknowledged before you sent obstruction danger, you must acknowledge it but keep the block instrument at train on line.

=== Receiving Obstruction Danger ===
If you receive '''obstruction danger (6)''' you must:

* Place or keep all stop signals towards the sending box at danger.
* Place or keep the block instrument for the line from the sending signal box to train on line.

If no train has been signalled towards the sending signal box, you must acknowledge obstruction danger.

If you cannot stop a train heading towards the signal box, or there is already a train in section, you must not acknowledge obstruction danger and immediately send '''train or vehicles proceeding without authority in the right direction'''.

If you succeed in stopping a train, you must then acknowledge '''obstruction danger''' and send '''cancelling'''.

You must then find out why obstruction danger was sent, and reach a clear understanding of the lines that remain blocked and which can be re-opened for trains.

=== Obstruction Removed ===
When the obstruction has been removed, or if a train can pass clear of the obstruction, you must send call attention followed by '''obstruction removed''' (2-1-2) and place your block instrument to normal.

However, if there is a train in section you must not send '''obstruction removed''' until that train is clear of the section.
}}

{{GuideSection
|border_color=#e09f00
|section_id=3.10
|section_title=Procedure: Train or Vehicles Proceeding Without Authority
|content=
=== Train or vehicles proceeding without authority in the right direction (4-5-5) ===

==== If a train or vehicle proceeds without authority in the right direction, you must: ====
* Without sending call attention, send the bell code for train or vehicles proceeding without authority in the right direction, 4-5-5.
* Stop any train travelling on the opposite line if you consider this to be necessary.
* If possible, alter points to divert trains and prevent collisions.
* Place or keep signals at danger against the train and and any other train that could be put at danger.
* If possible, arrange for the line on which the train is proceeding without authority to be cleared.
* Take the necessary action for any level crossings.
* Take any other possible action to reduce the risk of a collision.

==== If you receive train or vehicle proceeds without authority in the right direction, you must: ====
* Place or keep the block instrument at train on line for that line.
* If necessary, send train or vehicles proceeding without authority in the right direction to the next signal box, unless you can divert or stop the train.
* Stop any train travelling on the opposite line if you consider this to be necessary.
* If possible, alter points to divert trains and prevent collisions.
* Place or keep signals at danger against the train and and any other train that could be put at danger.
* If possible, arrange for the line on which the train is proceeding without authority to be cleared.
* Take the necessary action for any level crossings.
* Take any other possible action to reduce the risk of a collision.

==== If there is already a train in section, you must: ====
* If you can, allow the train to pass, and then immediately replace signals against the train proceeding without authority.
* You must not send train out of section until both trains have left the block section complete with tail lamp.

If there is no train in section you must send train out of section and signal the next train as normal. 

=== Train or vehicles proceeding without authority in the wrong direction (2-5-5) ===

==== If a train or vehicle proceeds without authority in the wrong direction, you must: ====
* Without sending call attention, send the bell code for train or vehicles proceeding without authority in the wrong direction, 2-5-5.
* Place or keep the block instrument at train on line.
* If possible, alter points to divert trains and prevent collisions.
* Place or keep signals at danger against the train and and any other train that could be put at danger.
* If possible, arrange for the line on which the train is proceeding without authority to be cleared.
* Take the necessary action for any level crossings.
* Take any other possible action to reduce the risk of a collision.

==== If you receive train or vehicle proceeds without authority in the wrong direction, you must: ====
* Stop any train going towards the signal box.
* If possible, divert the train onto the right line or a siding.
* If necessary, stop any train on the right line coming from the signal box.
* If possible, alter points to divert trains and prevent collisions.
* Take the necessary action for any level crossings.
* Take any other possible action to reduce the risk of a collision.
* If necessary, send train or vehicles proceeding without authority in the right/wrong direction to the next signal box.
}}

==Electric Token Block Signalling==

{{GuideSection
|border_color=brown
|section_id=4.1
|section_title=Tokens and Occupation Keys
|content=
[[File:Tyer's No.9 Diagram.png|right|alt=Diagram of Tyer's No.9 Token Instrument|frameless|235x235px]] 
On the line between [[Benyhone Loop Signal Box]] and [[Fanory Mill Signal Box]], the Electric Token Block regulations are used to signal trains. Like the Absolute Block regulations seen above, the main principle of the system is to have ''one train, in one section, at one time.'' ETB, however, is fundamentally different in that drivers must be in possession of an object, known as a token, to proceed onto the single line block section.

Both boxes make use of a Tyer's No.9 Key Token Instrument. These consist of: 

*A galvanometer, which shows whether current is flowing through the instrument (when a bell sounds or token is being released).
*An indicator, which shows whether a token is in or out.
*A magazine, which holds a bank of key tokens.
*A plunger, which operates the bell and releases the other instrument's tokens when held down.

When signalling a train using the token instruments, the same procedures must be followed as the absolute block system mentioned above in section 3.1, however:   

*When accepting a train, you must hold down the plunger on the last beat until the token is removed.
*When offering a train, you may only take a token whilst it is being released by the box in advance's last beat.
*Note that the token '''must''' pass through the instrument before being given to another driver.
}}

 	
== Tokenless Block Signalling ==
	
{{GuideSection
|border_color=Green
|section_id=5.1
|section_title=Tokenless Block - Brief History
|content=[[File:Tb-inst.jpg|right|alt=Tokenless Block Instrument for Western Region|frameless|235x235px]]
Tokenless Block method of working is the newest addition into Dovedale. It's offered itself as an alternative to Electric Token Block. It originated from the Western Region of the British Railway in 1967 on the line between Wilton and Pinhoe in Exeter.
In essence it is similar to the Electric Token Block method, but the instrument itself is more akin to the Absolute Block instrument. It was designed for signallers in the western region whom, during the economy of that time, had to cover other duties that does not pertain exclusively to signalling.
With this method of working, signallers are allowed to leave the block instrument on accepting, thus permitting them to leave the signal box to attend to other duties.
Its main advantages are that there are no bell signals required, and less attention is required from the signaller.
}}
	
{{GuideSection
|border_color=green
|section_id=5.2
|section_title=Tokenless Block - Principle
|content=[[File:SAT TB.png|right|alt=BR Tokenless Block Instrument|frameless|235x235px]]
Like all other regulations/methods of working, its main principle is to have "one train, in one section, at one time". Tokenless Block however, like the name implies, does not require a token unlike the ETB system in the section above.
	
What we have in Dovedale is based on the Tokenless Block Instrument for the BR Middle-eastern region. These consist of:
	
*A single-needle indicator, with three different positions: "Normal, Train Accepted and Train In Section".
*An acceptance switch, used to accept trains from adjacent box.
*An "Offer" button used to offer a train to an adjacent box.
*A "Train Arrived" button used to reset the block instrument back to normal once the train has arrived.
}}
	
{{GuideSection
|border_color=green
|section_id=5.3
|section_title=Tokenless Block - Operation
|content=Tokenless block operation is largely different compared to other methods of working in game. Bell signals are not needed for this method of working.
	
To offer a train, you must perform the following:
	
*Ensure that your instrument acceptance lever is on "Normal".
*Ensure that the accepting box acceptance lever is on "Accepting".
*Press offer, then wait for the indicator to turn to "Train Accepted".
*Once accepted, you now can clear the section signal.
	
For ease of operation, Dovedale's TB Instruments have sounds in them that can be used as alerts similar to bell codes in other block instruments. If the accepting box's acceptance lever is not set to accepting, it will make a bell sound alerting them. Once their acceptance lever has been changed to accepting, the box that offered a train will be notified with a bell.
	
Once the section signal is cleared and the train has passed it, the train will occupy a track circuit, causing both boxes' TB instruments to move to "Train In Section".
	
When the train arrives at the receiving box it will activate a treadle and two track circuits in succession. (Anything else will cause the system to prevent Train Arrived from being pressed) If the train is complete with a tail lamp, the accepting box will then turn the acceptance lever to normal, before pressing Train Arrived to reset the block instrument to normal.
	
When accepting, simply perform the actions of the accepting signal box above.
	
If the offering box needs to cancel the train, the signaller must ask the accepting box to turn their block instrument to Normal then press Train Arrived to reset it.
	
If the train despawns mid-section, the accepting signal box must turn their block instrument to Normal and press Train Arrived, then notify the offering signal box that the train has despawned.
}}

==Operating Signals ==

{{GuideSection
|border_color=lightblue
|section_id=6.1
|section_title=Clearing and Replacing Signals
|content=
=== '''Clearing Stop Signals''' ===
Before clearing a stop signal, you must ensure that: 

* All points and facing point locks are set for the movement.
* Any level crossings before another stop signal are in the closed position.
* There are no obstructions on the route.
* If necessary, you have received permission from the controlling signaller of the (next) section.

Where the next stop signal is at danger, you must not clear a signal that cannot display a caution aspect until the train is nearly at a stand. This is to ensure that the driver's speed is controlled to stop at the next signal.

=== '''Replacing Stop Signals''' ===
You must replace a stop signal to danger as soon as the last vehicle of the trainset has '''passed''' the signal, and it has passed over all points facing to the movement. 

=== Clearing Distant Signals ===
Before clearing a distant signal, you must ensure that all stop signals '''until the next distant signal''' or '''until the end of the section''' are set to clear. 

=== '''Replacing Distant Signals''' ===
You must replace a distant signal to caution as soon as the train has '''passed''' the signal.

=== '''Clearing Shunt Signals''' ===
You should always attempt to clear all shunt signals required for the movement before allowing the driver to proceed. If you cannot clear all shunt signals, and you need to stop the train at an intermediate shunt signal, you should first advise the driver. 
}}

{{GuideSection
|border_color=lightblue
|section_id=6.2
|section_title=Passing Signals at Danger
|content=
Before authorising a driver to pass a signal at danger, you must ensure that: 

* All points and facing point locks are set for the movement.
* Any level crossings are in the closed position.
* There are no obstructions on the route.
* If necessary, you have received permission from the controlling signaller of the (next) section.
* A conflicting movement has not been authorised.

When passing a signal at danger, you must reach a '''clear understanding''' with the driver as to what move will occur. You must tell the driver: 

* Which signal needs passed at danger.
* The reason why the signal needs to be passed at danger.
* If necessary, that the driver needs to proceed at caution.
* That the driver needs to obey all further signs and signals.

You may then provide verbal authority to pass the signal, or provide a yellow handsignal.
}}

{{GuideSection
|border_color=lightblue
|section_id=6.3
|section_title=Making Unsignalled Moves
|content=
Before making an unsignalled move, you must ensure that: 

* All points and facing point locks are set for the movement.
* Any level crossings are in the closed position.
* There are no obstructions on the route.
* If necessary, you have received permission from the controlling signaller of the (next) section.
* A conflicting movement has not been authorised.

You must reach a '''clear understanding''' with the driver as to what move will occur. You must then either: 

* Provide verbal authority to the driver to proceed, or
* Provide a yellow hand signal to the driver.
}}

{{GuideSection
|border_color=lightblue
|section_id=6.4
|section_title=Signal Passed at Danger
|content=
If a train has passed a signal at danger, or you have been made aware of a train heading towards your signal box without authority, you must:

* If necessary, and without sending call attention, send '''train or vehicles proceeding without authority''' to the next signal box.
* Stop any train travelling on the opposite line if you consider this to be necessary.
* If possible, alter points to divert trains and prevent collisions.
* Place or keep signals at danger against the train and and any other train that could be put at danger.
* If possible, arrange for the line on which the train is proceeding without authority to be cleared.
* Take the necessary action for any level crossings.
* Take any other possible action to reduce the risk of a collision.
}}

==Additional Resources==

{{GuideSection
|border_color=#f0a1e1
|section_id=7.1
|section_title=Charts
|content=See the [[Charts]] and [[Map|System Map]] pages for layouts of each box's signalling area, and of the overall game.
}}

{{GuideSection
|border_color=#f0a1e1
|section_id=7.2
|section_title=Related Videos
|content=
Some of the systems mentioned are used in real life around the world. Here are some examples and explainer videos. 
British Rail Signalling Guide (UK)
{{#ev:youtube|wAO3JbXYRnI}}
A full explanatory video of how a token exchange works in real life. (Singapore)
{{#ev:youtube|7CXHtTjz170}}
A full explanatory video of the entire token exchange system. (India) 
{{#ev:youtube|7nMzyjO-jLE}}
}}

{{GuideSection
|border_color=#f0a1e1
|section_id=7.3
|section_title=Related Pages
|content=
* [[Signals]] 
* [[Signs]]
* [[Bell Codes]]
* [[List of Signal Boxes]]
}}

{{GuideSection
|border_color=#f0a1e1
|section_id=7.4
|section_title=Qualified Signaller Handbook
|content=The handbook details further information such as detailed procedures, extra roleplay notes and regulations specific to Qualified Signallers. You can find the Qualified Signaller Handbook [[Qualified_Signaller_Handbook|here]].
}}

==References==

<references />
[[Category:Guides]]

{{GuidesNavplate}}