BNSF
| BNSF Railway | 1 |
CR
| Conrail | 1 |
CTHX
| COLOSSAL TRANSPORT SOLUTIONS, LLC | 1 |
FEC
| Florida East Coast | 1 |
HTTX
| TTX Company | 2 |
ITTX
| TTX Company | 1 |
JTTX
| TTX Company | 1 |
LTTX
| TTX Company | 1 |
OTTX
| TTX Company | 3 |
QTTX
| TTX Company | 13 |
QUAX
| Redstreak, LLC | 1 |
TTNX
| TTX Company | 2 |
XTTX
| TTX Company | 1 |