AMTK
| Amtrak | 1 |
ATSF
| Atchison Topeka & Santa Fe | 8 |
BO
| Baltimore & Ohio | 2 |
CBQ
| Chicago Burlington & Quincy | 3 |
CCT
| Central California Traction Company | 13 |
CRIP
| Chicago Rock Island & Pacific | 1 |
DODX
| Department Of Defense | 1 |
DRGW
| Denver & Rio Grande Western | 18 |
DSNG
| Durango & Silverton Narrow Gauge Railroa | 10 |
EVEX
| EVEX | 1 |
HVRX
| Heber Valley Historic Railroad | 4 |
LNWX
| Locomotives Northwest Limited | 10 |
MILW
| Milwaukee Road | 11 |
MNS
| Minneapolis Northfield & Southern | 1 |
NN
| Northern Nevada Railroad Corporation | 2 |
NP
| Northern Pacific | 4 |
OERM
| OERM | 2 |
OSHX
| OSHX | 1 |
PCRY
| PCRY | 5 |
PE
| Peoria & Eastern | 3 |
RFP
| Richmond Fredericksburg & Potomac | 1 |
SLGW
| Salt Lake Garfield and Western Railway Company | 2 |
SN
| Sacramento Northern | 1 |
SNCF
| French National Railways | 2 |
SP
| Southern Pacific | 67 |
SPMW
| Southern Pacific Maintenance of Way | 2 |
SRYC
| Sierra Railway Company of California | 1 |
SSW
| St Louis Southwestern (Cotton Belt) | 1 |
TCAX
| General Electric Rail Services | 1 |
USAX
| United States Army | 2 |
USN
| United States Navy | 4 |
VT
| Virginia & Truckee | 9 |
WM
| Western Maryland | 1 |
WP
| Western Pacific | 5 |