ABEX
| Advanced BioEnergy | 1 |
AC
| Algoma Central | 1 |
BO
| Baltimore & Ohio | 10 |
CBH
| CBH | 1 |
CO
| Chesapeake & Ohio | 10 |
CR
| Conrail | 17 |
CRR
| Clinchfield | 1 |
CSX
| CSX Railroad | 398 |
CWRX
| CWR TRANSPORTATION CO. | 1 |
HTT
| Harsco Track Technologies | 1 |
HZGX
| Herzog Contracting Corporation | 2 |
MT
| Mississippi and Tennessee RailNet Incorporated | 1 |
NS
| Norfolk Southern | 11 |
NW
| Norfolk & Western | 6 |
NYC
| New York Central | 2 |
PAT
| Port Auhority of Allegheny County | 2 |
PC
| Penn Central | 1 |
RJCP
| R.J. Corman Railroad Company/ Pennsylvan | 3 |
RMSX
| Pandrol Jackson Incorporated | 6 |
SP
| Southern Pacific | 1 |
SRS
| Sperry Rail Service | 1 |
ST
| Springfield Terminal | 2 |
TRI
| TRI | 1 |
URR
| Union Railroad | 4 |
VSR
| Valley & Siletz RR | 2 |
WE
| Wheeling & Lake Erie | 2 |