AGR
| Alabama and Gulf Coast | 2 |
ALM
| Arkansas Louisiana and Mississippi Railr | 1 |
ATW
| Atlantic and Western | 8 |
BN
| Burlington Northern | 1 |
BNSF
| BNSF Railway | 1 |
CCO
| Clinchfield | 1 |
CHW
| Chesapeake Western | 1 |
CIRR
| Chattahoochee Industrial Railroad | 1 |
CN
| Canadian National Railways | 2 |
CO
| Chesapeake & Ohio | 1 |
CR
| Conrail | 1 |
CRR
| Clinchfield | 1 |
CSX
| CSX Railroad | 2 |
DWC
| Canadian National Railways | 1 |
EEC
| East Erie Commercial Railroad | 1 |
GC
| Georgia Central | 2 |
GNRR
| Georgia Northeastern | 10 |
HS
| H and S Railroad Company | 2 |
IANR
| Iowa Northern Ry | 1 |
IBT
| International Bridge and Terminal Company | 1 |
KCS
| Kansas City Southern | 1 |
LN
| Louisville & Nashville | 2 |
MSDR
| Knoxville & Holston River Railroad | 1 |
NS
| Norfolk Southern | 14 |
NSHR
| North Shore | 1 |
NW
| Norfolk & Western | 2 |
PICK
| Pickens Railway | 2 |
RBOX
| Railbox Company | 1 |
RJCC
| R.J. Corman Railroad/Kentucky Lines | 1 |
RJCM
| R.J. Corman Railroad Company/ Memphis Li | 3 |
SIND
| Southern Indiana Railway Incorporated | 2 |
SLGG
| Progress Rail Services Corporation | 2 |
SOU
| Southern | 11 |
TBOX
| TTX Company | 1 |
UP
| Union Pacific Railroad Company | 1 |
USA
| USA | 6 |
WM
| Western Maryland | 1 |