ATW
| Atlantic and Western | 1 |
BN
| Burlington Northern | 1 |
BNSF
| BNSF Railway | 7 |
CN
| Canadian National Railways | 1 |
COEH
| Conecuh Valley Railroad | 1 |
FPPX
| Fayette Power Project (Texas) | 1 |
HZGX
| Herzog Contracting Corporation | 2 |
KCLX
| Kansas City Power and Light Company | 1 |
TEPX
| Tucson Electric Power Company | 2 |
TFM
| Kansas City Southern De Mexico | 2 |
TR
| Tomahawk Railway L.P. | 1 |
UP
| Union Pacific Railroad Company | 1 |