BO
| Baltimore & Ohio | 4 |
BWCX
| GE Plastics | 21 |
CI
| Cambria and Indiana Railroad Company | 2 |
IC
| Illinois Central | 1 |
MTR
| Montour RR | 1 |
NRBX
| Fruit Growers Express Company | 1 |
NRPX
| Northrop Corporation | 3 |
NW
| Norfolk & Western | 1 |
NYC
| New York Central | 2 |
PLE
| Pittsburgh & Lake Erie | 2 |
PRR
| Pennsylvania Railroad | 51 |