BN
| Burlington Northern | 1 |
CP
| Canadian Pacific Railway | 1 |
CW
| Colorado and Wyoming | 1 |
DRGW
| Denver & Rio Grande Western | 2 |
GIMX
| General American Marks Company | 1 |
IC
| Illinois Central | 1 |
IFRX
| Infinity Rail LLC | 1 |
MP
| Missouri Pacific | 1 |
MRL
| Montana Rail Link | 1 |
MVKX
| Tubular Transport Services | 2 |
NOKL
| Northwestern Oklahoma | 2 |
SOO
| Soo Line | 1 |
SSW
| St Louis Southwestern (Cotton Belt) | 4 |
TR
| Tomahawk Railway L.P. | 1 |
TTJX
| TTX Company-Bulkhead Flats | 2 |
TTPX
| TTX Company - Bulkhead Flats | 13 |
UP
| Union Pacific Railroad Company | 11 |