BN
| Burlington Northern | 1 |
CR
| Conrail | 2 |
CSX
| CSX Railroad | 42 |
LMIX
| Loram Maintenance of Way Inc. | 1 |
MPA
| Maryland and Pennsylvania Railroad | 2 |
NS
| Norfolk Southern | 3 |
NW
| Norfolk & Western | 1 |
NYC
| New York Central | 1 |
SOU
| Southern | 1 |
SPSX
| Progress Rail Services Corp | 6 |
WM
| Western Maryland | 3 |
YKRX
| York Rail | 1 |