| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Capitaltrains Ltd | 05053964 | 28/06/2005 | Dissolved |
| London & West Midlands Railways Holdings Ltd | 05875373 | 28/07/2006 | Dissolved |
| London & West Midlands Railways Ltd | 05875150 | 28/07/2006 | Dissolved |
| RAIL INSIGHTS LTD | 04806876 | 20/06/2003 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ALSTOM ACADEMY FOR RAIL | 00293588 | 17/04/2002 | 11/08/2003 | Not Trading |
| ALSTOM NL SERVICE PROVISION LTD | 02849400 | 16/07/2002 | 14/10/2003 | Silver |
| DSB (U.K.) LIMITED | 04313833 | 30/03/2006 | 17/08/2007 | Dissolved |
| FIRST NORTH LONDON RAILWAY LIMITED | 04839667 | 08/05/2006 | 01/12/2008 | Dissolved |
| GENERAL ELECTRIC ENERGY UK LIMITED | 04267931 | 17/04/2002 | 31/01/2003 | Bronze |
| London Railways Ltd | 05760329 | 19/04/2006 | 08/05/2006 | Dissolved |
| ROCK RAIL EAST ANGLIA (HOLDINGS) 1 LIMITED | 10266130 | 22/01/2019 | 30/06/2024 | Amber |
| ROCK RAIL EAST ANGLIA (HOLDINGS) 2 LIMITED | 09918883 | 22/01/2019 | 30/06/2024 | Amber |
| ROCK RAIL EAST ANGLIA PLC | 10360543 | 22/01/2019 | 30/06/2024 | Amber |
| ROCK RAIL MAIN-WESER HOLDCO LIMITED | 14027835 | 22/06/2023 | 30/06/2024 | Bronze |
| ROCK RAIL MAIN-WESER PARENT LIMITED | 14027776 | 22/06/2023 | 30/06/2024 | Bronze |
| ROCK RAIL MOORGATE (HOLDINGS) LIMITED | 09978017 | 22/01/2019 | 30/06/2024 | Amber |
| ROCK RAIL MOORGATE PLC | 09978049 | 22/11/2017 | 30/06/2024 | Amber |
| ROCK RAIL SOUTH WESTERN (HOLDINGS) 1 LIMITED | 10749688 | 22/01/2019 | 30/06/2024 | Silver |
| ROCK RAIL SOUTH WESTERN (HOLDINGS) 2 LIMITED | 10752611 | 22/01/2019 | 30/06/2024 | Amber |
| ROCK RAIL SOUTH WESTERN PLC | 10754652 | 22/11/2017 | 30/06/2024 | Silver |
| ROCK RAIL WEST COAST (HOLDINGS) 1 LIMITED | 12240357 | 21/01/2020 | 30/06/2024 | Silver |
| ROCK RAIL WEST COAST (HOLDINGS) 2 LIMITED | 12240463 | 21/01/2020 | 30/06/2024 | Amber |
| ROCK RAIL WEST COAST PLC | 12240504 | 21/01/2020 | 30/06/2024 | Silver |
| Railway Claims Ltd | 02911996 | 29/09/1994 | 31/10/1997 | Dissolved |
| THAMES TRAINS LIMITED | 03007943 | 10/01/1995 | 31/01/1999 | Not Trading |
| THAMESLINK RAIL LIMITED | 03013232 | 28/02/1997 | 31/01/1999 | Strike Off |
| VICTORY RAILWAY HOLDINGS LIMITED | 03147927 | 12/03/1996 | 31/01/1999 | Not Trading |