ATW
| Atlantic and Western | 2 |
BN
| Burlington Northern | 1 |
CAGY
| Columbus & Greenville Railway | 1 |
CNW
| Chicago & Northwestern | 5 |
CP
| Canadian Pacific Railway | 1 |
CR
| Conrail | 4 |
CSS
| Chicago South Shore And South Bend | 1 |
CSX
| CSX Railroad | 5 |
FXE
| Ferromex | 1 |
GRW
| Gary Railway | 1 |
GTW
| Grand Trunk Western | 2 |
ICE
| Iowa Chicago and Eastern | 1 |
IHB
| Indiana Harbor Belt | 2 |
KCS
| Kansas City Southern | 3 |
LW
| Louisville and Wadley Railway Company | 1 |
NS
| Norfolk Southern | 5 |
NSAX
| National Steel Corporation | 1 |
NW
| Norfolk & Western | 2 |
SFS
| Santa Fe Southern | 1 |
SOO
| Soo Line | 1 |
SOU
| Southern | 2 |
SP
| Southern Pacific | 1 |
TR
| Tomahawk Railway L.P. | 2 |
UP
| Union Pacific Railroad Company | 2 |
WRWK
| Providence & Worchester Railroad | 1 |