AGR
| Alabama and Gulf Coast | 1 |
AOK
| Arkansas-Oklahoma Railroad | 1 |
ATW
| Atlantic and Western | 2 |
BKTY
| Union Pacific Railroad Company | 5 |
CIRR
| Chattahoochee Industrial Railroad | 2 |
CSX
| CSX Railroad | 4 |
EEC
| East Erie Commercial Railroad | 8 |
GMRC
| Green Mountain RR | 1 |
GTRA
| Golden Triangle Railroad | 1 |
HS
| H and S Railroad Company | 5 |
IANR
| Iowa Northern Ry | 1 |
KCS
| Kansas City Southern | 3 |
NS
| Norfolk Southern | 5 |
PDRR
| Pee Dee River RR | 1 |
SMW
| St Marys Railway West LLC | 2 |
SOU
| Southern | 2 |
SRN
| Sabine River & Northern | 1 |
WRWK
| Providence & Worchester Railroad | 1 |
YB
| Youngstown Belt Railroad Company | 1 |