AMTK
| Amtrak | 2 |
BAR
| Bangor & Aroostook | 1 |
BO
| Baltimore & Ohio | 2 |
CBQ
| Chicago Burlington & Quincy | 1 |
CMPA
| Madison Railroad Division of City of Mad | 1 |
CO
| Chesapeake & Ohio | 2 |
CSX
| CSX Railroad | 2 |
ERIE
| Erie Railroad | 1 |
FLNX
| R.P. Flynn Incorporated d/b/a Ohio Railway Supply | 1 |
LN
| Louisville & Nashville | 1 |
MARC
| Maryland Transit Administration | 3 |
MKT
| Missouri-Kansas-Texas | 1 |
MRLX
| Mid America Rail Car Leasing | 1 |
NP
| Northern Pacific | 2 |
NS
| Norfolk Southern | 2 |
NSR
| Newburgh and South Shore Railroad Compan | 2 |
PPCX
| AAPRCO Register Private Cars | 2 |
RBBX
| Ringling Bros. and Barnum and Bailey | 33 |
RCPX
| Railcar Limited | 1 |
RNRH
| RNRH | 1 |
RPCX
| Railroad Passenger Car Numbering Bureau | 1 |
SLRG
| San Luis and Rio Grande Railroad | 3 |
SOU
| Southern | 1 |
VRIC
| Virginia Rail Investment | 2 |
WMSR
| Western Maryland Scenic | 2 |