AGR
| Alabama and Gulf Coast | 2 |
BCOL
| Canadian National Railways | 1 |
BN
| Burlington Northern | 3 |
BNSF
| BNSF Railway | 2 |
CN
| Canadian National Railways | 1 |
CNA
| Canadian National Railways | 2 |
CNW
| Chicago & Northwestern | 3 |
CPAA
| Canadian Pacific Railway | 1 |
CSX
| CSX Railroad | 8 |
CUOH
| Columbus and Ohio River Railroad Company | 1 |
EEC
| East Erie Commercial Railroad | 1 |
GNWR
| Genesee and Wyoming Railroad Company | 13 |
GTRA
| Golden Triangle Railroad | 1 |
HS
| H and S Railroad Company | 2 |
KCS
| Kansas City Southern | 1 |
MSDR
| Knoxville & Holston River Railroad | 2 |
NKCR
| Nebraska, Kansas & Colorado RailNet, Inc | 2 |
NOKL
| Northwestern Oklahoma | 3 |
NS
| Norfolk Southern | 11 |
SLGG
| Progress Rail Services Corporation | 1 |
SOU
| Southern | 16 |
SRN
| Sabine River & Northern | 3 |
WLO
| Waterloo Railway Company (Illinois Central) | 3 |