ATSF
| Atchison Topeka & Santa Fe | 14 |
BN
| Burlington Northern | 1 |
BNSF
| BNSF Railway | 7 |
CRYX
| Cryo-Trans Incorporated | 52 |
DRGW
| Denver & Rio Grande Western | 1 |
JRSX
| J.R. Simplot Company | 1 |
MP
| Missouri Pacific | 2 |
SP
| Southern Pacific | 2 |
SSW
| St Louis Southwestern (Cotton Belt) | 3 |
UP
| Union Pacific Railroad Company | 1 |