ACL
| Atlantic Coast Line | 3 |
ATSF
| Atchison Topeka & Santa Fe | 1 |
BN
| Burlington Northern | 7 |
BNSF
| BNSF Railway | 9 |
CO
| Chesapeake & Ohio | 4 |
CP
| Canadian Pacific Railway | 31 |
CR
| Conrail | 35 |
CRR
| Clinchfield | 1 |
CSX
| CSX Railroad | 165 |
DRGW
| Denver & Rio Grande Western | 2 |
HZGX
| Herzog Contracting Corporation | 1 |
LN
| Louisville & Nashville | 4 |
MP
| Missouri Pacific | 1 |
MRL
| Montana Rail Link | 1 |
NS
| Norfolk Southern | 5 |
NW
| Norfolk & Western | 8 |
NYC
| New York Central | 49 |
PC
| Penn Central | 3 |
PRSX
| Progress Rail Service | 1 |
SBD
| Seaboard System | 22 |
SCL
| Seaboard Coast Line | 17 |
SOO
| Soo Line | 3 |
SOU
| Southern | 1 |
THB
| Toronto Hamilton & Buffalo | 3 |
TYOX
| The Tie Yard Of Omaha Inc. | 3 |
UP
| Union Pacific Railroad Company | 1 |