BO
| Baltimore & Ohio | 5 |
CR
| Conrail | 3 |
LEFC
| Lake Erie, Franklin & Claron | 2 |
NKP
| Nickel Plate | 1 |
NW
| Norfolk & Western | 6 |
PC
| Penn Central | 1 |
PRR
| Pennsylvania Railroad | 16 |
SPAX
| Southeastern Pennsylvania Transportation (SEPTA) | 1 |
SSX
| Southern States Phosphate and Fertilizer Co. | 1 |
WM
| Western Maryland | 1 |