ADMX
| ADM Transportation Company | 1 |
ANX
| ANX | 1 |
APAC
| APAC | 1 |
ATEX
| Asplundh Tree Expert Co Railroad Division | 1 |
ATSF
| Atchison Topeka & Santa Fe | 2 |
AWW
| Algiers Winslow and Western Railway | 1 |
BAR
| Bangor & Aroostook | 2 |
BM
| Boston & Maine | 1 |
BN
| Burlington Northern | 23 |
BNSF
| BNSF Railway | 3 |
BO
| Baltimore & Ohio | 10 |
BS
| Birmingham Southern RR | 1 |
BX
| BX | 1 |
CANX
| CANAC International | 9 |
CBQ
| Chicago Burlington & Quincy | 2 |
CN
| Canadian National Railways | 13 |
CNW
| Chicago & Northwestern | 8 |
CO
| Chesapeake & Ohio | 4 |
CP
| Canadian Pacific Railway | 11 |
CR
| Conrail | 42 |
CRIP
| Chicago Rock Island & Pacific | 1 |
CSX
| CSX Railroad | 26 |
CUVA
| ISG Cleveland Works Railway Company | 1 |
CWRO
| Cleveland Works Rail Operations | 1 |
DM
| Detroit & Mackinac | 1 |
DMIR
| Duluth Missabe & Iron Range | 1 |
EBT
| East Broad Top | 1 |
EJE
| Elgin Joliet and Eastern | 2 |
EL
| Erie Lackawanna | 2 |
FGWX
| Federal Grain Inspection Service (USDA) (Scale Test Cars) | 7 |
FRA
| Federal Railroad Administration | 2 |
GN
| Great Northern | 1 |
GRMS
| GRMS | 1 |
GRR
| Georgetown Railroad Company | 1 |
GTW
| Grand Trunk Western | 2 |
HJCU
| HANJIN Container Lines Limited | 1 |
IC
| Illinois Central | 4 |
ICG
| Illinois Central Gulf | 1 |
IMPX
| IMPX | 1 |
JPBX
| Joint Powers Board (CalTrain) | 1 |
KCS
| Kansas City Southern | 2 |
KKFU
| Kawasaki Kisen Kaisha Ltd. | 1 |
LN
| Louisville & Nashville | 2 |
LSI
| Lake Superior and Ishpeming Railroad | 5 |
MEC
| Maine Central | 2 |
MILW
| Milwaukee Road | 2 |
MINX
| MINX | 1 |
MKT
| Missouri-Kansas-Texas | 1 |
MNWX
| Minnesota Dept. of Public Service Weights and Measures Divis | 2 |
MP
| Missouri Pacific | 13 |
MPX
| COLUMBIAN CARBON CO., MAGNETIC PIGMENT DIV. | 4 |
NATX
| General Electric Rail Services | 1 |
NN
| Northern Nevada Railroad Corporation | 1 |
NS
| Norfolk Southern | 23 |
NW
| Norfolk & Western | 8 |
NYC
| New York Central | 7 |
OREX
| Oregon Department of Agriculture | 2 |
PB
| PB | 1 |
PBNE
| Philadelphia Bethlehem and New England R | 1 |
PC
| Penn Central | 3 |
PKP
| Polish Railways | 1 |
PLE
| Pittsburgh & Lake Erie | 1 |
PRR
| Pennsylvania Railroad | 5 |
PW
| Providence and Worcester | 1 |
RDG
| Reading Railroad | 3 |
SAS
| South African Railways | 1 |
SBD
| Seaboard System | 3 |
SLSF
| Saint Louis-San Francisco | 1 |
SOO
| Soo Line | 1 |
SOU
| Southern | 2 |
SPMW
| Southern Pacific Maintenance of Way | 6 |
SRS
| Sperry Rail Service | 1 |
SSW
| St Louis Southwestern (Cotton Belt) | 1 |
TMMW
| Texas-Mexican MofW | 2 |
UP
| Union Pacific Railroad Company | 17 |
URR
| Union Railroad | 1 |
VBR
| Virginia Blue Ridge Railway | 1 |
WA
| Washington & Atlanta Railroad | 1 |
WC
| Wisconsin Central | 1 |
WDAX
| Washington Department of Agriculture | 3 |
WO
| WO | 4 |
WRA
| Western Railway of Alabama | 1 |
WUTX
| WUTX | 3 |
WWBX
| WWIB Transportation Services | 3 |
WWIB
| Western Weighing & Inspection Bureau | 1 |
X
| X | 2 |