BO
| Baltimore & Ohio | 4 |
BRK
| BRK | 2 |
BST
| BST | 2 |
DC
| Delray Connecting Railroad Company | 6 |
IC
| Illinois Central | 1 |
KBR
| KBR | 8 |
LMIX
| Loram Maintenance of Way Inc. | 1 |
MK
| MK | 4 |
MT
| Mississippi and Tennessee RailNet Incorporated | 3 |
NS
| Norfolk Southern | 4 |
NW
| Norfolk & Western | 2 |
SBC
| Ferrocarril Sonora Baja California | 4 |
TR
| Tomahawk Railway L.P. | 2 |