AARX
| Association of American Railroads | 3 |
ABPS
| ABPS | 1 |
AMTK
| Amtrak | 32 |
ATSF
| Atchison Topeka & Santa Fe | 20 |
BO
| Baltimore & Ohio | 1 |
CBQ
| Chicago Burlington & Quincy | 19 |
CCRR
| Claremont Concord | 13 |
CDTX
| California DOT | 72 |
CEI
| Chicago & Eastern Illinois | 1 |
CN
| Canadian National Railways | 1 |
CNW
| Chicago & Northwestern | 3 |
CRIP
| Chicago Rock Island & Pacific | 14 |
CSL
| Chicago Short Line Railway Company | 2 |
CWR
| CWR Incorporated | 2 |
DLMX
| Daylight Locomotives and Machine Works Incorporated | 2 |
DRGW
| Denver & Rio Grande Western | 4 |
DSNG
| Durango & Silverton Narrow Gauge Railroa | 164 |
FW
| Fillmore & Western | 1 |
GANO
| Georgia Northern Railway Company | 1 |
GFRR
| Georgia and Florida Railnet | 6 |
GN
| Great Northern | 4 |
GTW
| Grand Trunk Western | 1 |
HVRX
| Heber Valley Historic Railroad | 17 |
ITC
| Illinois Terminal Railroad | 3 |
JPBX
| Joint Powers Board (CalTrain) | 3 |
MILW
| Milwaukee Road | 2 |
MKT
| Missouri-Kansas-Texas | 3 |
MSV
| Mississippi and Skuna Valley Railroad Co | 5 |
NC
| CSX Transportation Incorporated | 2 |
NP
| Northern Pacific | 6 |
OAE
| OAE | 2 |
OCSR
| OCSR | 9 |
ORLC
| ORLC | 7 |
PE
| Peoria & Eastern | 3 |
PLA
| Pacific Locomotive Association [Niles Canyon Railway] | 43 |
PNWC
| PNWC | 6 |
PPCX
| AAPRCO Register Private Cars | 2 |
PULL
| Pullman | 8 |
RBBX
| Ringling Bros. and Barnum and Bailey | 1 |
RCBT
| RCBT | 4 |
SCBG
| Santa Cruz Big Trees & Pacific | 9 |
SDAE
| San Diego & Arizona Eastern | 3 |
SERA
| Sierra Northern Railway | 1 |
SLGW
| Salt Lake Garfield and Western Railway Company | 2 |
SLU
| SLU | 15 |
SN
| Sacramento Northern | 1 |
SOO
| Soo Line | 1 |
SP
| Southern Pacific | 126 |
SPS
| Spokane Portland & Seattle | 15 |
SRYC
| Sierra Railway Company of California | 26 |
SSCR
| SSCR | 1 |
SSRR
| Sacramento Southern | 12 |
STIB
| STIB | 2 |
SW
| Southwestern Railroad Company | 2 |
TG
| TG | 1 |
UP
| Union Pacific Railroad Company | 23 |
UPP
| Union Pacific Passenger | 36 |
USAX
| United States Army | 1 |
VT
| Virginia & Truckee | 49 |
WP
| Western Pacific | 19 |
WPRR
| Willamette and Pacific | 2 |
YV
| YV | 2 |