AC
| Algoma Central | 1 |
AMTK
| Amtrak | 4 |
BN
| Burlington Northern | 5 |
BNSF
| BNSF Railway | 1 |
BO
| Baltimore & Ohio | 3 |
BR
| Buffalo and Pittsburgh | 2 |
CIL
| Chicago Indianapolis & Louisville (Monon | 5 |
CN
| Canadian National Railways | 6 |
CNJW
| CNJW | 1 |
CNW
| Chicago & Northwestern | 1 |
CO
| Chesapeake & Ohio | 5 |
CP
| Canadian Pacific Railway | 1 |
CR
| Conrail | 1 |
CSX
| CSX Railroad | 8 |
CTA
| Chicago Transit Authority | 4 |
CWI
| Chicago and Western Indiana | 1 |
CWRX
| CWR TRANSPORTATION CO. | 2 |
DM
| Detroit & Mackinac | 5 |
DMIR
| Duluth Missabe & Iron Range | 1 |
DRGW
| Denver & Rio Grande Western | 1 |
DTI
| Detroit Toledo & Ironton | 2 |
EJE
| Elgin Joliet and Eastern | 2 |
EMCO
| EMCO | 1 |
GTW
| Grand Trunk Western | 8 |
HZGX
| Herzog Contracting Corporation | 1 |
IC
| Illinois Central | 5 |
KUCX
| Kentucky Utilities Company | 1 |
LIRR
| Long Island Railroad | 1 |
LMIX
| Loram Maintenance of Way Inc. | 2 |
LN
| Louisville & Nashville | 1 |
METX
| METRA | 2 |
MILW
| Milwaukee Road | 1 |
MKT
| Missouri-Kansas-Texas | 3 |
MON
| Monon Route | 5 |
MTR
| Montour RR | 2 |
NCMX
| North Carolina Transportation Museum | 1 |
NCSL
| Nashville Chattanooga & St Louis | 1 |
NP
| Northern Pacific | 1 |
NS
| Norfolk Southern | 3 |
NW
| Norfolk & Western | 9 |
NYC
| New York Central | 2 |
PC
| Penn Central | 1 |
RCPE
| Rapid City Pierre & Eastern Railroad | 1 |
SOU
| Southern | 14 |
SP
| Southern Pacific | 4 |
SPMW
| Southern Pacific Maintenance of Way | 5 |
SPS
| Spokane Portland & Seattle | 1 |
SSW
| St Louis Southwestern (Cotton Belt) | 1 |
UP
| Union Pacific Railroad Company | 16 |
VGN
| Virginian Railway | 2 |
WGRR
| WGRR | 1 |
WPRX
| WPRX | 1 |
WVRR
| Whitewater Valley Railroad | 3 |