AMTK
| Amtrak | 1 |
BAR
| Bangor & Aroostook | 1 |
CNJ
| Central Rail Road of New Jersey | 1 |
DH
| Delaware & Hudson | 1 |
DLW
| Delaware Lackawanna & Western | 3 |
MBTA
| Massachusetts Bay Transit Authority | 2 |
NRHX
| National Railway Historical Society | 1 |
NS
| Norfolk Southern | 4 |
PC
| Penn Central | 1 |
PRR
| Pennsylvania Railroad | 2 |
RFP
| Richmond Fredericksburg & Potomac | 1 |
RPCX
| Railroad Passenger Car Numbering Bureau | 2 |
SUEX
| SUEX | 1 |