ACL
| Atlantic Coast Line | 9 |
AEE
| American European Express | 1 |
AMTK
| Amtrak | 14 |
ATSF
| Atchison Topeka & Santa Fe | 21 |
BM
| Boston & Maine | 1 |
BN
| Burlington Northern | 4 |
BO
| Baltimore & Ohio | 1 |
CBQ
| Chicago Burlington & Quincy | 14 |
CO
| Chesapeake & Ohio | 2 |
DH
| Delaware & Hudson | 2 |
DRGW
| Denver & Rio Grande Western | 16 |
ERIE
| Erie Railroad | 1 |
GN
| Great Northern | 9 |
GS
| Gloster Southern | 2 |
IC
| Illinois Central | 2 |
KCS
| Kansas City Southern | 1 |
LN
| Louisville & Nashville | 2 |
MILW
| Milwaukee Road | 3 |
MP
| Missouri Pacific | 1 |
NKP
| Nickel Plate | 2 |
NP
| Northern Pacific | 11 |
NS
| Norfolk Southern | 7 |
NYC
| New York Central | 3 |
PC
| Penn Central | 1 |
PPCX
| AAPRCO Register Private Cars | 3 |
PRR
| Pennsylvania Railroad | 1 |
RRP
| RRP | 1 |
SP
| Southern Pacific | 11 |
SPMW
| Southern Pacific Maintenance of Way | 1 |
SPS
| Spokane Portland & Seattle | 3 |
TVRM
| Tennessee Valley | 1 |
UP
| Union Pacific Railroad Company | 29 |
UPP
| Union Pacific Passenger | 1 |
WP
| Western Pacific | 2 |