AMTK
| Amtrak | 2 |
BO
| Baltimore & Ohio | 1 |
BSCX
| Bethlehem Steel Corporation | 2 |
CNJ
| Central Rail Road of New Jersey | 3 |
CO
| Chesapeake & Ohio | 2 |
DH
| Delaware & Hudson | 1 |
DLW
| Delaware Lackawanna & Western | 1 |
LV
| Lehigh Valley | 1 |
MKT
| Missouri-Kansas-Texas | 2 |
NH
| New Haven | 1 |
NW
| Norfolk & Western | 2 |
PRR
| Pennsylvania Railroad | 1 |
SRC
| Strasburg Railroad | 1 |
WM
| Western Maryland | 1 |