AMTK
| Amtrak | 1 |
BO
| Baltimore & Ohio | 5 |
CNJ
| Central Rail Road of New Jersey | 1 |
CP
| Canadian Pacific Railway | 4 |
CR
| Conrail | 2 |
CSX
| CSX Railroad | 1 |
DH
| Delaware & Hudson | 11 |
DL
| Delaware-Lackawanna Railroad Company | 6 |
GREX
| Georgetown Rail Equipment Company | 1 |
LMIX
| Loram Maintenance of Way Inc. | 7 |
NW
| Norfolk & Western | 3 |
PC
| Penn Central | 1 |
RUT
| Vermont Railway Incorporated | 1 |
SOU
| Southern | 1 |
SPSX
| Progress Rail Services Corp | 7 |
WCRL
| West Chester Railroad Company | 1 |
WCRR
| WCRR | 1 |