AMTK
| Amtrak | 3 |
ATEX
| Asplundh Tree Expert Co Railroad Division | 1 |
CBH
| CBH | 1 |
CRR
| Clinchfield | 1 |
CSX
| CSX Railroad | 27 |
LMIX
| Loram Maintenance of Way Inc. | 1 |
NS
| Norfolk Southern | 24 |
NW
| Norfolk & Western | 19 |
PACX
| Plasser American Corporation | 1 |
RKCX
| Knox Kershaw Incorporated | 2 |
SBD
| Seaboard System | 1 |
SOU
| Southern | 6 |
YKRX
| York Rail | 1 |