ATSF
| Atchison Topeka & Santa Fe | 59 |
BN
| Burlington Northern | 6 |
BNSF
| BNSF Railway | 4 |
CRYX
| Cryo-Trans Incorporated | 7 |
CSX
| CSX Railroad | 6 |
DRGW
| Denver & Rio Grande Western | 13 |
MP
| Missouri Pacific | 8 |
SP
| Southern Pacific | 13 |
SSW
| St Louis Southwestern (Cotton Belt) | 16 |
UP
| Union Pacific Railroad Company | 3 |