ATSF
| Atchison Topeka & Santa Fe | 3 |
BN
| Burlington Northern | 5 |
BNSF
| BNSF Railway | 1 |
CNW
| Chicago & Northwestern | 9 |
CS
| Colorado & Southern | 1 |
CSX
| CSX Railroad | 1 |
DRGW
| Denver & Rio Grande Western | 1 |
MP
| Missouri Pacific | 5 |
SP
| Southern Pacific | 3 |
SPSX
| Progress Rail Services Corp | 1 |
UP
| Union Pacific Railroad Company | 9 |