ATW
| Atlantic and Western | 2 |
BCOL
| Canadian National Railways | 1 |
BN
| Burlington Northern | 2 |
BNSF
| BNSF Railway | 2 |
CHTT
| Chicago Heights Terminal Transfer | 1 |
CNW
| Chicago & Northwestern | 3 |
CSX
| CSX Railroad | 4 |
EEC
| East Erie Commercial Railroad | 11 |
FBOX
| TTX Company | 1 |
FXE
| Ferromex | 9 |
HS
| H and S Railroad Company | 13 |
KCS
| Kansas City Southern | 2 |
MRL
| Montana Rail Link | 1 |
NOKL
| Northwestern Oklahoma | 1 |
NS
| Norfolk Southern | 2 |
RBOX
| Railbox Company | 6 |
SOU
| Southern | 5 |
SP
| Southern Pacific | 6 |
SSW
| St Louis Southwestern (Cotton Belt) | 2 |
TASD
| Terminal Alabama State Docks | 1 |
TBOX
| TTX Company | 2 |
UP
| Union Pacific Railroad Company | 8 |
VCY
| Galveston Railroad, L.P. | 5 |
WE
| Wheeling & Lake Erie | 1 |
WLO
| Waterloo Railway Company (Illinois Central) | 1 |
WP
| Western Pacific | 1 |