AGR
| Alabama and Gulf Coast | 1 |
AM
| Arkansas & Missouri | 1 |
ATW
| Atlantic and Western | 2 |
BN
| Burlington Northern | 8 |
BNSF
| BNSF Railway | 5 |
CN
| Canadian National Railways | 3 |
CNA
| Canadian National Railways | 1 |
CNW
| Chicago & Northwestern | 1 |
CP
| Canadian Pacific Railway | 3 |
CPAA
| Canadian Pacific Railway | 1 |
CSX
| CSX Railroad | 7 |
CUOH
| Columbus and Ohio River Railroad Company | 1 |
EEC
| East Erie Commercial Railroad | 1 |
FCCM
| Compania de Ferrocarriles Chiapas Mayab | 1 |
FXE
| Ferromex | 1 |
GNWR
| Genesee and Wyoming Railroad Company | 2 |
HESR
| Huron and Eastern | 2 |
HS
| H and S Railroad Company | 2 |
IATR
| Iowa Traction Railroad Company | 6 |
IC
| Illinois Central | 4 |
KCS
| Kansas City Southern | 6 |
KYLE
| Kyle Railroad | 4 |
LVRC
| Lamoille Valley | 1 |
MP
| Missouri Pacific | 1 |
MSDR
| Knoxville & Holston River Railroad | 3 |
NOKL
| Northwestern Oklahoma | 7 |
NS
| Norfolk Southern | 11 |
RJCC
| R.J. Corman Railroad/Kentucky Lines | 1 |
SGLR
| Seminole Gulf | 2 |
SLC
| San Luis Central Railroad Company | 1 |
SLGG
| Progress Rail Services Corporation | 2 |
SOU
| Southern | 20 |
SRN
| Sabine River & Northern | 3 |
WLO
| Waterloo Railway Company (Illinois Central) | 4 |