BN
| Burlington Northern | 2 |
BO
| Baltimore & Ohio | 1 |
CN
| Canadian National Railways | 1 |
CNW
| Chicago & Northwestern | 6 |
CO
| Chesapeake & Ohio | 3 |
CR
| Conrail | 5 |
CRIP
| Chicago Rock Island & Pacific | 1 |
CSX
| CSX Railroad | 8 |
DRGW
| Denver & Rio Grande Western | 1 |
EL
| Erie Lackawanna | 4 |
HZGX
| Herzog Contracting Corporation | 18 |
MP
| Missouri Pacific | 2 |
NS
| Norfolk Southern | 1 |
UP
| Union Pacific Railroad Company | 5 |