ARR
| Alaska Railroad | 19 |
BN
| Burlington Northern | 9 |
BNSF
| BNSF Railway | 22 |
CC
| Chicago Central & Pacific | 2 |
CN
| Canadian National Railways | 2 |
CNJ
| Central Rail Road of New Jersey | 2 |
CNW
| Chicago & Northwestern | 4 |
CNWX
| Canadian Wheat Board | 4 |
CO
| Chesapeake & Ohio | 2 |
CP
| Canadian Pacific Railway | 8 |
CR
| Conrail | 32 |
CSX
| CSX Railroad | 49 |
CWRX
| CWR TRANSPORTATION CO. | 1 |
FTSX
| Fairmont Tamper | 3 |
GREX
| Georgetown Rail Equipment Company | 6 |
HOLL
| HOLL | 1 |
HREX
| Heavy Railroad Excavations Incorporated | 1 |
HRZ
| HRZ | 1 |
HZGX
| Herzog Contracting Corporation | 4 |
IC
| Illinois Central | 3 |
ICG
| Illinois Central Gulf | 1 |
LBFX
| L B Foster Co | 1 |
LC
| Lancaster & Chester | 1 |
LIMX
| CHEMICAL LIME CO. | 3 |
LIRR
| Long Island Railroad | 1 |
LMIX
| Loram Maintenance of Way Inc. | 5 |
METX
| METRA | 1 |
MP
| Missouri Pacific | 6 |
MRL
| Montana Rail Link | 3 |
MSRC
| Kansas City Southern | 1 |
NP
| Northern Pacific | 1 |
NS
| Norfolk Southern | 39 |
NW
| Norfolk & Western | 12 |
NYC
| New York Central | 2 |
OVR
| Otter Valley Railroad | 1 |
PAR
| PAR | 1 |
PTM
| Portland Terminal | 2 |
RDG
| Reading Railroad | 1 |
RGAX
| RGAX | 2 |
RRVW
| Red River Valley and Western Railroad | 1 |
RUT
| Vermont Railway Incorporated | 1 |
SOO
| Soo Line | 4 |
SOU
| Southern | 13 |
SPMW
| Southern Pacific Maintenance of Way | 18 |
SPS
| Spokane Portland & Seattle | 1 |
SPSX
| Progress Rail Services Corp | 1 |
SRS
| Sperry Rail Service | 1 |
TCRX
| Tennessee Central Railway Musem | 2 |
UCRY
| Utah Central | 1 |
UP
| Union Pacific Railroad Company | 34 |
UPP
| Union Pacific Passenger | 1 |
VB
| Van Buren Bridge Company (Bangor & Aroostook) | 3 |
VLIX
| Vintage Locomotives Inc | 2 |
VTR
| Vermont Railway | 1 |
WM
| Western Maryland | 1 |
WP
| Western Pacific | 1 |
WSOR
| Wisconsin & Southern | 2 |