AOK
| Arkansas-Oklahoma Railroad | 1 |
ATW
| Atlantic and Western | 4 |
BAEX
| Andersons | 1 |
BN
| Burlington Northern | 1 |
CSX
| CSX Railroad | 3 |
FBOX
| TTX Company | 2 |
IBT
| International Bridge and Terminal Company | 2 |
KCS
| Kansas City Southern | 1 |
MEC
| Maine Central | 1 |
NS
| Norfolk Southern | 4 |
PDRR
| Pee Dee River RR | 1 |
RBOX
| Railbox Company | 1 |
SOU
| Southern | 3 |
SP
| Southern Pacific | 1 |
TBOX
| TTX Company | 3 |