AERC
| Albany and Eastern Railroad Company | 2 |
ALS
| Alton & Southern Railway | 1 |
AM
| Arkansas & Missouri | 3 |
AMTK
| Amtrak | 30 |
AOK
| Arkansas-Oklahoma Railroad | 1 |
ARZC
| Arizona and California Railroad | 3 |
ATSF
| Atchison Topeka & Santa Fe | 54 |
BCOL
| Canadian National Railways | 25 |
BN
| Burlington Northern | 105 |
BNSF
| BNSF Railway | 288 |
BRC
| Belt Railway of Chicago | 1 |
CAGY
| Columbus & Greenville Railway | 4 |
CANX
| CANAC International | 1 |
CBQ
| Chicago Burlington & Quincy | 12 |
CC
| Chicago Central & Pacific | 1 |
CEMR
| Central Manitoba Railway Incorporated | 2 |
CGW
| Chicago Great Western | 1 |
CN
| Canadian National Railways | 264 |
CNA
| Canadian National Railways | 2 |
CNIS
| Canadian National Railways | 1 |
CNW
| Chicago & Northwestern | 9 |
CO
| Chesapeake & Ohio | 26 |
CP
| Canadian Pacific Railway | 125 |
CR
| Conrail | 31 |
CSX
| CSX Railroad | 535 |
CWRX
| CWR TRANSPORTATION CO. | 34 |
DAKR
| Dakota Rail Incorporated | 1 |
DCLR
| Delaware Coast Line RR Co | 1 |
DH
| Delaware & Hudson | 1 |
DL
| Delaware-Lackawanna Railroad Company | 1 |
DRGW
| Denver & Rio Grande Western | 6 |
DSRC
| Dakota Southern Railway Company | 1 |
EJE
| Elgin Joliet and Eastern | 1 |
FTSX
| Fairmont Tamper | 46 |
GREX
| Georgetown Rail Equipment Company | 1 |
GTW
| Grand Trunk Western | 7 |
HMIX
| Henkels and McCoy Inc | 2 |
HZGX
| Herzog Contracting Corporation | 2 |
IAIS
| Iowa Interstate | 2 |
IC
| Illinois Central | 19 |
ICG
| Illinois Central Gulf | 3 |
IMRL
| I&M Rail Link | 1 |
JDIX
| Jim Dobbas Incorporated | 1 |
JESX
| James E Strates Shows | 2 |
KCS
| Kansas City Southern | 24 |
LMIX
| Loram Maintenance of Way Inc. | 2 |
LN
| Louisville & Nashville | 1 |
ME
| Morristown & Erie Railroad | 1 |
MILW
| Milwaukee Road | 6 |
MNCW
| Metro-North Commuter Railroad | 1 |
MP
| Missouri Pacific | 152 |
MRL
| Montana Rail Link | 3 |
NAR
| Northern Alberta Railways | 1 |
NJT
| New Jersey Transit | 1 |
NJTR
| NJ Transit Rail Operations | 1 |
NP
| Northern Pacific | 1 |
NS
| Norfolk Southern | 301 |
NW
| Norfolk & Western | 122 |
NYC
| New York Central | 61 |
OTRX
| On-Track Railway Services Limited | 1 |
PACX
| Plasser American Corporation | 1 |
PC
| Penn Central | 1 |
PRSX
| Progress Rail Service | 2 |
QUAX
| Redstreak, LLC | 50 |
RISX
| RISX | 3 |
RRVW
| Red River Valley and Western Railroad | 1 |
RTIX
| RTI - Railroad Services | 32 |
RWCX
| RWC Incorporated | 1 |
SBD
| Seaboard System | 23 |
SCAX
| SOUTHERN CALIFORNIA REGIONAL RAIL AUTHORITY | 2 |
SOO
| Soo Line | 32 |
SOU
| Southern | 77 |
SP
| Southern Pacific | 117 |
SPMW
| Southern Pacific Maintenance of Way | 25 |
SPSX
| Progress Rail Services Corp | 81 |
SRC
| Strasburg Railroad | 1 |
SSW
| St Louis Southwestern (Cotton Belt) | 43 |
TCWR
| Twin Cities and Western | 1 |
TFM
| Kansas City Southern De Mexico | 4 |
TVRR
| Tulare Valley Railroad Company | 1 |
UP
| Union Pacific Railroad Company | 348 |
UPP
| Union Pacific Passenger | 1 |
VRCX
| Vortex Recycling | 1 |
WC
| Wisconsin Central | 15 |
WP
| Western Pacific | 7 |
WSOR
| Wisconsin & Southern | 1 |