1. Administrador de Infraestructuras Ferroviarias (Adif)
2. Alstom SA
3. Aurizon LTD
4. Australian Rail Track Corporation
5. Bechtel Corporation
6. BNSF Railway Company
7. Canadian National Railway Company
8. Central Japan Railway Company
9. China Railway Corporation
10. CSX Transportation
11. Deutsche Bahn AG
12. FS Group
13. Kansas City Southern Railway
14. Kawasaki Heavy Industries
15. Kiewit Corporation
16. National Railroad Passenger Corporation
17. Network Rail Infrastructure Limited
18. Norfolk Southern Corp
19. Siemens AG
20. Skanska AB
21. SNCF Group Foundation
22. The Walsh Group
23. Union Pacific Railroad Company