| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Capital Link Railways Ltd | 05323745 | 04/01/2005 | Dissolved |
| Enterprise Rail Ltd | 02937494 | 09/09/1994 | Dissolved |
| FORMER IRO | 03923542 | 01/01/2008 | Dissolved |
| Nx Scotrail Ltd | SC265553 | 29/03/2004 | Dissolved |
| Paul Martin | 03336781 | 28/09/2006 | Dissolved |
| South Western Railway Ltd | 03949588 | 29/06/2006 | Dissolved |
| Western Rail Ltd | 05059198 | 11/08/2004 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CENTRAL TRAINS LIMITED | 03007938 | 17/03/2003 | 05/05/2010 | Not Trading |
| INSTITUTION OF RAILWAY OPERATORS LIMITED | 07655952 | 02/06/2011 | 15/09/2018 | Dissolved |
| LONDON EASTERN RAILWAY LIMITED | 04955356 | 01/02/2004 | 05/05/2010 | Not Trading |
| MAINTRAIN LIMITED | 02918124 | 01/03/2003 | 05/05/2010 | Not Trading |
| MIDLAND MAIN LINE LIMITED | 03007934 | 01/03/2003 | 05/05/2010 | Not Trading |
| NATIONAL EXPRESS RAILWAY PROPERTY HOLDINGS LIMITED | 04261276 | 20/11/2003 | 16/08/2007 | Dissolved |
| NATIONAL EXPRESS SERVICES LIMITED | 05876695 | 14/07/2006 | 05/05/2010 | One Red Flag |
| NATIONAL EXPRESS TRAINS LIMITED | 01949696 | 01/03/2003 | 05/05/2010 | Silver |
| NATIONAL EXPRESS TRAINS REGIONAL LIMITED | 04338144 | 13/02/2004 | 05/05/2010 | Dissolved |
| NATIONAL EXPRESS TRAINS SOUTH EAST LIMITED | 04338151 | 13/02/2004 | 05/05/2010 | Dissolved |
| NATIONAL EXPRESS UK LIMITED | 05876716 | 14/07/2006 | 05/05/2010 | Silver |
| NE NO. 3 LIMITED | 02938993 | 01/02/2004 | 05/05/2010 | Not Trading |
| NE NO.1 LTD | 02912338 | 01/02/2004 | 05/05/2010 | Not Trading |
| NE NO.2 LTD | 03011029 | 01/02/2004 | 05/05/2010 | Not Trading |
| NE TRAINS SOUTH LIMITED | 05236567 | 21/09/2004 | 05/05/2010 | Not Trading |
| NEW SOUTHERN RAILWAY LIMITED | 03010919 | 26/08/2001 | 28/02/2003 | Amber |
| NORTH WESTERN TRAINS COMPANY LIMITED | 03007946 | 02/12/1998 | 15/06/2001 | Dissolved |
| NOTTINGHAM TRAMS LIMITED | 07644670 | 17/04/2012 | 18/12/2012 | Gold |
| NX SERVICES LIMITED | 06829417 | 09/04/2009 | 05/05/2010 | Dissolved |
| NXEC TRAINS LIMITED | 05876737 | 14/07/2006 | 05/05/2010 | Not Trading |
| PRENFEX LIMITED | 06610722 | 10/06/2008 | 26/02/2010 | Dissolved |
| QJUMP LIMITED | 04124436 | 10/03/2003 | 09/02/2004 | Bronze |
| SCOTRAIL RAILWAYS LIMITED | 02938994 | 01/03/2003 | 05/05/2010 | Not Trading |
| SILVERLINK TRAIN SERVICES LIMITED | 03007935 | 01/02/2004 | 05/05/2010 | Not Trading |
| THAMES TRAINS LIMITED | 03007943 | 10/10/1996 | 28/11/1998 | Not Trading |
| TRAFALGAR TRAINS LIMITED | 05599963 | 21/10/2005 | 05/05/2010 | Dissolved |
| VICTORY RAILWAY HOLDINGS LIMITED | 03147927 | 20/08/1996 | 28/11/1998 | Not Trading |
| WEST ANGLIA GREAT NORTHERN RAILWAY LIMITED | 03007944 | 01/02/2004 | 05/05/2010 | Not Trading |