BKTY
| Union Pacific Railroad Company | 3 |
BN
| Burlington Northern | 1 |
BNSF
| BNSF Railway | 4 |
CNW
| Chicago & Northwestern | 6 |
DRGW
| Denver & Rio Grande Western | 8 |
HATX
| Helm Financial Corporation | 2 |
HLMX
| Helm Financial Corporation | 1 |
HZGX
| Herzog Contracting Corporation | 21 |
KCS
| Kansas City Southern | 3 |
MKT
| Missouri-Kansas-Texas | 1 |
QRSX
| Quality Railway Services and Supply Company | 1 |
RMDX
| American Refrigerator Transit Company | 1 |
RVSC
| Rio Valley Switching Company | 38 |
SI
| Union Pacific Railroad Company (Spokane International) | 4 |
SP
| Southern Pacific | 9 |
SPMW
| Southern Pacific Maintenance of Way | 1 |
SR
| Kansas City Southern | 2 |
TFM
| Kansas City Southern De Mexico | 1 |
TM
| Texas-Mexican | 3 |
UP
| Union Pacific Railroad Company | 27 |
WP
| Western Pacific | 1 |