| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ALH RAIL COATINGS LIMITED | 03974438 | 25/03/2011 | Dissolved |
| GRANTTRAM LIMITED | 05556178 | 30/11/2009 | Dissolved |
| RAIL SAFETY AND STANDARDS BOARD LIMITED | 04655675 | 01/03/2019 | Gold |
| RAILWAY INDUSTRY ASSOCIATION | 10036044 | 29/03/2016 | Bronze |
| VOLKERMATRIX LIMITED | 03298375 | 30/11/2009 | Not Trading |
| VOLKERRAIL GROUP LIMITED | 04930080 | 12/02/2010 | Silver |
| VOLKERRAIL LIMITED | 03184313 | 30/11/2009 | Silver |
| VOLKERRAIL PLANT LIMITED | 05113722 | 30/11/2009 | Not Trading |
| VOLKERRAIL POWER LIMITED | 03439458 | 30/11/2009 | Not Trading |
| VOLKERRAIL SIGNALLING LIMITED | 04417843 | 30/11/2009 | Not Trading |
| VOLKERRAIL SPECIALIST BUSINESSES LIMITED | 04197945 | 30/11/2009 | Silver |
| VOLKERRAIL WELDING LIMITED | 04417852 | 30/11/2009 | Not Trading |
| VOLKERWESSELS UK LIMITED | 01179305 | 01/09/2016 | Silver |
| Volker Weiss Ltd | 06591743 | 30/11/2009 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CARILLION AM GOVERNMENT LIMITED | 00885404 | 18/10/2007 | 31/05/2009 | Insolvent |
| CARILLION UTILITY SERVICES GROUP LIMITED | 01521006 | 18/10/2007 | 31/05/2009 | Insolvent |
| CARILLION UTILITY SERVICES LIMITED | 00728599 | 18/10/2007 | 31/05/2009 | Insolvent |
| CARILLION UTILITY SERVICES S.E. LIMITED | 02355338 | 18/10/2007 | 31/05/2009 | Insolvent |
| INSTITUTION OF RAILWAY OPERATORS LIMITED | 07655952 | 19/04/2013 | 22/05/2019 | Dissolved |