Satus Locomotive Services (SLS) is a company that operates on the network. According to the company, they store, refurbish, preserve and convert rolling stock for use. The company also provides freight work and track work.
Satus Locomotive Services is currently based at the SLS Maintenance Yard.
A new shed is currently in the progress of being constructed and will be delivered at a later date due to delays.
Fleet
| Photo | Class | Livery | Name | Notes |
|---|---|---|---|---|
 |
Class 150139 | LNWR Marstem Vale Line | N/A | Unit is fit for Mainline |
 |
Class 950001 | Network Rail Yellow | N/A | Unit is fit for Mainline |
 |
Class 27112 | BR Green w/o BR Crest | Poppy | Entering service soon |
 |
Class 37419 | Intercity | Par Signal Box 1880 - 2024 144 Years of operation | Re-entering service soon |
 |
Class 145069 | Plain Blue (Arriva Trains Wales Blue Doors) | N/A | Unit is fit for Mainline |
 |
Class 92021 | BR two-tone grey | N/A | Unit is fit for Mainline |
 |
Class 58101 | EWS Maroon and yellow | N/A | Unit is fit for Mainline |
 |
Class 58102 | EWS Maroon and yellow | N/A | Unit is fit for Mainline |
Former Fleet
| Photo | Class | Livery | Name | Notes |
|---|---|---|---|---|
 |
Class 145101 | Arriva Trains Wales | N/A | SCRAPPED |