ACL
| Atlantic Coast Line | 8 |
AEE
| American European Express | 1 |
AMTK
| Amtrak | 10 |
ATSF
| Atchison Topeka & Santa Fe | 10 |
BM
| Boston & Maine | 1 |
BN
| Burlington Northern | 4 |
BO
| Baltimore & Ohio | 1 |
CBQ
| Chicago Burlington & Quincy | 14 |
CLK
| Cadillac & Lake City | 1 |
CO
| Chesapeake & Ohio | 2 |
DH
| Delaware & Hudson | 2 |
DRGW
| Denver & Rio Grande Western | 14 |
ERIE
| Erie Railroad | 1 |
GN
| Great Northern | 8 |
IC
| Illinois Central | 2 |
LN
| Louisville & Nashville | 2 |
MILW
| Milwaukee Road | 1 |
NKP
| Nickel Plate | 1 |
NP
| Northern Pacific | 7 |
NYC
| New York Central | 1 |
NYSW
| New York Susquehanna & Western | 1 |
PPCX
| AAPRCO Register Private Cars | 3 |
PRR
| Pennsylvania Railroad | 1 |
SCL
| Seaboard Coast Line | 1 |
SLCC
| St. Louis Car Company | 1 |
SP
| Southern Pacific | 19 |
SPS
| Spokane Portland & Seattle | 2 |
UP
| Union Pacific Railroad Company | 22 |
WP
| Western Pacific | 2 |