AM
| Arkansas & Missouri | 2 |
AN
| Apalachicola Northern | 2 |
ATW
| Atlantic and Western | 1 |
CIRR
| Chattahoochee Industrial Railroad | 1 |
CP
| Canadian Pacific Railway | 1 |
CPAA
| Canadian Pacific Railway | 2 |
FCRD
| First Coast Railway | 8 |
FSRR
| FerroSur | 3 |
FXE
| Ferromex | 9 |
GTRA
| Golden Triangle Railroad | 1 |
LRS
| Laurinburg and Southern | 13 |
MB
| Meridian & Bigbee | 3 |
MQT
| Marquette Rail | 2 |
RBOX
| Railbox Company | 117 |
SOU
| Southern | 2 |
TSRD
| Twin State Railroad Company | 1 |