| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| AIF RAIL LIMITED | 09603621 | 21/05/2015 | Dissolved |
| AIF RAIL LIMITED | 14986214 | 06/07/2023 | Bronze |
| DFT OPERATOR LIMITED | 07141122 | 15/11/2024 | Bronze |
| ISR INVESTMENTS LIMITED | 16096681 | 24/11/2024 | Amber |
| LONDON OVERGROUND RAIL OPERATIONS LTD | 05668786 | 01/10/2020 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ARRIVA TRAINS HOLDINGS LIMITED | 03076782 | 31/03/2008 | 24/03/2014 | Silver |
| ARRIVA TRAINS WALES/TRENAU ARRIVA CYMRU LIMITED | 04337645 | 01/01/2013 | 24/03/2014 | Gold |
| FIRST MTR SOUTH WESTERN TRAINS LIMITED | 07900320 | 01/10/2020 | 29/03/2024 | Bronze |
| GCRC HOLDINGS LIMITED | 06036740 | 01/01/2013 | 24/03/2014 | Dissolved |
| GRAND CENTRAL RAILWAY COMPANY LIMITED | 03979826 | 01/01/2013 | 24/03/2014 | Silver |
| LONDON AND NORTH WESTERN RAILWAY COMPANY LIMITED | 02880012 | 01/01/2013 | 24/03/2014 | Gold |
| LONDON OVERGROUND RAIL OPERATIONS LTD | 05668786 | 31/12/2010 | 24/03/2014 | Dissolved |
| M40 TRAINS LIMITED | 03005018 | 31/03/2008 | 24/03/2014 | Silver |
| MERSEY 1 LIMITED | 12789417 | 16/04/2021 | 29/03/2024 | Silver |
| MTR (METRO TRAINS LONDON) LIMITED | 13552125 | 06/08/2021 | 29/03/2024 | Not Trading |
| MTR CORPORATION (CROSSRAIL) LIMITED | 08754715 | 24/09/2014 | 29/03/2024 | Silver |
| MTR CORPORATION (SILVERLINK) LIMITED | 05655294 | 01/02/2022 | 29/03/2024 | Not Trading |
| MTR CORPORATION (UK) LIMITED | 05205402 | 01/10/2020 | 29/03/2024 | Silver |
| MTR ELIZABETH LINE LIMITED | 11866994 | 01/10/2020 | 29/03/2024 | Not Trading |
| MTR PROPERTY DEVELOPMENT MANAGEMENT (UK) LIMITED | 12820016 | 01/02/2022 | 29/03/2024 | Gold |
| RAIL DELIVERY GROUP LIMITED | 08176197 | 01/10/2020 | 26/03/2024 | Bronze |
| RAIL SAFETY AND STANDARDS BOARD LIMITED | 04655675 | 11/11/2013 | 10/11/2022 | Gold |
| REGIO TYNE AND WEAR LIMITED | 06733214 | 01/01/2013 | 24/03/2014 | Strike Off |
| THE CHILTERN RAILWAY COMPANY LIMITED | 03007939 | 08/12/2010 | 24/03/2014 | Silver |
| XC TRAINS LIMITED | 04402048 | 01/01/2013 | 24/03/2014 | One Red Flag |