BN
| Burlington Northern | 2 |
BNSF
| BNSF Railway | 2 |
BO
| Baltimore & Ohio | 1 |
CO
| Chesapeake & Ohio | 1 |
CR
| Conrail | 4 |
CRR
| Clinchfield | 1 |
CSX
| CSX Railroad | 20 |
HZGX
| Herzog Contracting Corporation | 6 |
LN
| Louisville & Nashville | 1 |
MP
| Missouri Pacific | 2 |
NW
| Norfolk & Western | 3 |
NYC
| New York Central | 3 |
SBD
| Seaboard System | 4 |
SCL
| Seaboard Coast Line | 8 |
SOU
| Southern | 7 |