AOK
| Arkansas-Oklahoma Railroad | 1 |
ATSF
| Atchison Topeka & Santa Fe | 1 |
BNSF
| BNSF Railway | 6 |
ITTX
| TTX Company | 12 |
LBR
| Lowville and Beaver River Railroad Compa | 1 |
MTTX
| TTX Company | 1 |
NS
| Norfolk Southern | 1 |
PEYX
| Transportation Technology Services Inc | 2 |
PTTX
| TTX Company | 2 |
TFWX
| TTX COMPANY | 1 |
TTDX
| TTX Company - DOD Service Flats | 1 |