ACL
| Atlantic Coast Line | 5 |
AMTK
| Amtrak | 45 |
ATEX
| Asplundh Tree Expert Co Railroad Division | 1 |
ATSF
| Atchison Topeka & Santa Fe | 40 |
BAR
| Bangor & Aroostook | 2 |
BLE
| Bessemer & Lake Erie | 8 |
BN
| Burlington Northern | 64 |
BNSF
| BNSF Railway | 18 |
BO
| Baltimore & Ohio | 6 |
CANX
| CANAC International | 1 |
CBQ
| Chicago Burlington & Quincy | 56 |
CN
| Canadian National Railways | 72 |
CNW
| Chicago & Northwestern | 55 |
CO
| Chesapeake & Ohio | 13 |
CP
| Canadian Pacific Railway | 2 |
CR
| Conrail | 462 |
CS
| Colorado & Southern | 3 |
CSX
| CSX Railroad | 892 |
CSXX
| CSXX | 1 |
CTIE
| Kansas City Southern Railway Company | 1 |
DRGW
| Denver & Rio Grande Western | 14 |
DTI
| Detroit Toledo & Ironton | 2 |
EL
| Erie Lackawanna | 1 |
FTSX
| Fairmont Tamper | 1 |
GREX
| Georgetown Rail Equipment Company | 3 |
GTW
| Grand Trunk Western | 1 |
GWWR
| Gateway Western | 5 |
HPJX
| Helm-Pacific Leasing | 1 |
IC
| Illinois Central | 3 |
ICG
| Illinois Central Gulf | 3 |
KCS
| Kansas City Southern | 3 |
KCSM
| Kansas City Southern De Mexico | 1 |
LMIX
| Loram Maintenance of Way Inc. | 1 |
LN
| Louisville & Nashville | 7 |
MILW
| Milwaukee Road | 2 |
MKT
| Missouri-Kansas-Texas | 2 |
MP
| Missouri Pacific | 42 |
MRL
| Montana Rail Link | 1 |
MSRC
| Kansas City Southern | 3 |
NCRC
| Nebraska Central | 11 |
NDYX
| First Union Rail | 3 |
NS
| Norfolk Southern | 869 |
NSSX
| National Salvage and Service Corporation | 12 |
NW
| Norfolk & Western | 60 |
NYC
| New York Central | 95 |
PACX
| Plasser American Corporation | 6 |
PC
| Penn Central | 58 |
RFP
| Richmond Fredericksburg & Potomac | 1 |
RPCX
| Railroad Passenger Car Numbering Bureau | 1 |
RWCX
| RWC Incorporated | 9 |
RWKX
| RWKX | 1 |
SBD
| Seaboard System | 29 |
SCAX
| SOUTHERN CALIFORNIA REGIONAL RAIL AUTHORITY | 2 |
SCL
| Seaboard Coast Line | 24 |
SOO
| Soo Line | 1 |
SOU
| Southern | 181 |
SP
| Southern Pacific | 37 |
SPMW
| Southern Pacific Maintenance of Way | 3 |
SPSX
| Progress Rail Services Corp | 12 |
TFM
| Kansas City Southern De Mexico | 7 |
UP
| Union Pacific Railroad Company | 125 |
WC
| Wisconsin Central | 1 |
WP
| Western Pacific | 7 |
WSOR
| Wisconsin & Southern | 2 |