BN
| Burlington Northern | 2 |
BNSF
| BNSF Railway | 1 |
BO
| Baltimore & Ohio | 2 |
CANX
| CANAC International | 1 |
CN
| Canadian National Railways | 4 |
CO
| Chesapeake & Ohio | 3 |
CP
| Canadian Pacific Railway | 5 |
CR
| Conrail | 10 |
CRR
| Clinchfield | 1 |
CSX
| CSX Railroad | 31 |
GREX
| Georgetown Rail Equipment Company | 3 |
HZGX
| Herzog Contracting Corporation | 6 |
IC
| Illinois Central | 3 |
MP
| Missouri Pacific | 1 |
MRL
| Montana Rail Link | 1 |
NS
| Norfolk Southern | 15 |
NW
| Norfolk & Western | 8 |
NYC
| New York Central | 2 |
RWCX
| RWC Incorporated | 6 |
SBD
| Seaboard System | 1 |
SOO
| Soo Line | 6 |
SOU
| Southern | 14 |
SPAX
| Southeastern Pennsylvania Transportation (SEPTA) | 2 |
SPSX
| Progress Rail Services Corp | 2 |
UP
| Union Pacific Railroad Company | 1 |