AC
| Algoma Central | 1 |
ACL
| Atlantic Coast Line | 7 |
ACWR
| Aberdeen, Carolina & Western | 1 |
AMTK
| Amtrak | 11 |
ATSF
| Atchison Topeka & Santa Fe | 54 |
BKTY
| Union Pacific Railroad Company | 1 |
BN
| Burlington Northern | 88 |
BNSF
| BNSF Railway | 68 |
BO
| Baltimore & Ohio | 7 |
CN
| Canadian National Railways | 19 |
CNA
| Canadian National Railways | 1 |
CNIS
| Canadian National Railways | 2 |
CNW
| Chicago & Northwestern | 8 |
CO
| Chesapeake & Ohio | 9 |
CP
| Canadian Pacific Railway | 267 |
CR
| Conrail | 132 |
CRR
| Clinchfield | 1 |
CSX
| CSX Railroad | 547 |
DCLR
| Delaware Coast Line RR Co | 1 |
DH
| Delaware & Hudson | 1 |
DRGW
| Denver & Rio Grande Western | 2 |
DRRV
| DRRV | 1 |
EL
| Erie Lackawanna | 1 |
GNWR
| Genesee and Wyoming Railroad Company | 1 |
GTW
| Grand Trunk Western | 1 |
HABX
| Habco International Incorporated | 1 |
HZGX
| Herzog Contracting Corporation | 7 |
IC
| Illinois Central | 20 |
ICG
| Illinois Central Gulf | 4 |
IMRL
| I&M Rail Link | 3 |
LMIX
| Loram Maintenance of Way Inc. | 1 |
LN
| Louisville & Nashville | 29 |
MILW
| Milwaukee Road | 4 |
MKT
| Missouri-Kansas-Texas | 1 |
MP
| Missouri Pacific | 51 |
MPCX
| Michels Corporation | 2 |
MRL
| Montana Rail Link | 9 |
NCBX
| New Century Rail Transport LLC | 1 |
NP
| Northern Pacific | 1 |
NREX
| National Railway Equipment | 5 |
NS
| Norfolk Southern | 13 |
NW
| Norfolk & Western | 38 |
NYC
| New York Central | 190 |
PC
| Penn Central | 12 |
PRSX
| Progress Rail Service | 1 |
RFP
| Richmond Fredericksburg & Potomac | 4 |
RI
| RI | 1 |
RKCX
| Knox Kershaw Incorporated | 1 |
RMAX
| Rocky Mountain Rail Society | 1 |
RPCX
| Railroad Passenger Car Numbering Bureau | 1 |
SBD
| Seaboard System | 77 |
SCL
| Seaboard Coast Line | 76 |
SI
| Union Pacific Railroad Company (Spokane International) | 1 |
SIND
| Southern Indiana Railway Incorporated | 1 |
SOO
| Soo Line | 23 |
SOU
| Southern | 24 |
SP
| Southern Pacific | 1 |
SPMW
| Southern Pacific Maintenance of Way | 1 |
THB
| Toronto Hamilton & Buffalo | 22 |
TYOX
| The Tie Yard Of Omaha Inc. | 8 |
UP
| Union Pacific Railroad Company | 46 |
VCRX
| Vaughn Leasing and Rental Corporation | 1 |
WC
| Wisconsin Central | 5 |
WHRC
| Windsor and Hantsport Railway Company | 4 |
WM
| Western Maryland | 1 |
WSOR
| Wisconsin & Southern | 1 |