ATW
| Atlantic and Western | 1 |
BN
| Burlington Northern | 1 |
BNSF
| BNSF Railway | 2 |
CN
| Canadian National Railways | 1 |
CNW
| Chicago & Northwestern | 1 |
CSX
| CSX Railroad | 1 |
EEC
| East Erie Commercial Railroad | 4 |
FXE
| Ferromex | 3 |
HS
| H and S Railroad Company | 2 |
MRL
| Montana Rail Link | 1 |
NS
| Norfolk Southern | 3 |
SLC
| San Luis Central Railroad Company | 1 |
SOU
| Southern | 5 |
WLO
| Waterloo Railway Company (Illinois Central) | 1 |