AOK
| Arkansas-Oklahoma Railroad | 11 |
ATW
| Atlantic and Western | 12 |
BN
| Burlington Northern | 2 |
BNSF
| BNSF Railway | 8 |
BS
| Birmingham Southern RR | 2 |
CAGY
| Columbus & Greenville Railway | 2 |
CN
| Canadian National Railways | 2 |
CNW
| Chicago & Northwestern | 2 |
CO
| Chesapeake & Ohio | 1 |
CR
| Conrail | 3 |
CSX
| CSX Railroad | 4 |
EJE
| Elgin Joliet and Eastern | 4 |
FXE
| Ferromex | 9 |
GTW
| Grand Trunk Western | 1 |
HS
| H and S Railroad Company | 1 |
ICE
| Iowa Chicago and Eastern | 4 |
ICG
| Illinois Central Gulf | 1 |
IHB
| Indiana Harbor Belt | 1 |
KCS
| Kansas City Southern | 2 |
LRWN
| Little Rock & Western | 1 |
LW
| Louisville and Wadley Railway Company | 4 |
MKT
| Missouri-Kansas-Texas | 1 |
NS
| Norfolk Southern | 8 |
SP
| Southern Pacific | 1 |
TR
| Tomahawk Railway L.P. | 7 |
UP
| Union Pacific Railroad Company | 2 |