ABOX
| TTX Company | 4 |
ACL
| Atlantic Coast Line | 2 |
ADN
| Ashley Drew & Northern | 1 |
ALAB
| Alabama Railroad | 2 |
AMTK
| Amtrak | 1 |
ANR
| Angelina and Neches River Railroad | 1 |
AOK
| Arkansas-Oklahoma Railroad | 3 |
ARR
| Alaska Railroad | 4 |
ASAB
| Bay Line Railroad LLC | 1 |
ATSF
| Atchison Topeka & Santa Fe | 4 |
ATW
| Atlantic and Western | 10 |
AWP
| Atlanta & West Point | 1 |
BAR
| Bangor & Aroostook | 12 |
BCOL
| Canadian National Railways | 5 |
BLE
| Bessemer & Lake Erie | 2 |
BM
| Boston & Maine | 6 |
BN
| Burlington Northern | 1 |
BNSF
| BNSF Railway | 8 |
BO
| Baltimore & Ohio | 1 |
CAGY
| Columbus & Greenville Railway | 1 |
CBQ
| Chicago Burlington & Quincy | 3 |
CLC
| Columbia and Cowlitz Railway Company | 1 |
CN
| Canadian National Railways | 15 |
CNA
| Canadian National Railways | 5 |
CNW
| Chicago & Northwestern | 1 |
CO
| Chesapeake & Ohio | 3 |
CONX
| ConocoPhillips Company | 2 |
CP
| Canadian Pacific Railway | 13 |
CR
| Conrail | 11 |
CSX
| CSX Railroad | 19 |
CV
| Central Vermont | 4 |
DH
| Delaware & Hudson | 2 |
DM
| Detroit & Mackinac | 1 |
DRGW
| Denver & Rio Grande Western | 2 |
DWC
| Canadian National Railways | 2 |
EFCX
| Evergreen Freight Car Company | 1 |
EN
| Esquimalt & Nanaimo | 1 |
FBOX
| TTX Company | 3 |
GARX
| General American Marks Company | 1 |
GBW
| Green Bay & Western | 1 |
GNWR
| Genesee and Wyoming Railroad Company | 1 |
GTW
| Grand Trunk Western | 2 |
GVSR
| Galveston Railroad L.P. | 2 |
HCRC
| Hillsdale County Ry. Co., Inc. | 1 |
IBT
| International Bridge and Terminal Company | 5 |
IC
| Illinois Central | 1 |
ICG
| Illinois Central Gulf | 1 |
KCS
| Kansas City Southern | 7 |
LEF
| Lake Erie Franklin and Clarion Railroad Company | 3 |
LN
| Louisville & Nashville | 2 |
LNAC
| Chattahoochee Bay Railroad, LLC | 1 |
LOAM
| Lousiana Midland | 2 |
LUNX
| General Electric Rail Services | 1 |
LV
| Lehigh Valley | 2 |
LW
| Louisville and Wadley Railway Company | 2 |
MDW
| Minnesota Dakota and Western Railway Com | 1 |
MEC
| Maine Central | 9 |
MED
| MED | 1 |
MILW
| Milwaukee Road | 1 |
MNJ
| Middletown & New Jersey Railroad | 1 |
MNS
| Minneapolis Northfield & Southern | 1 |
MP
| Missouri Pacific | 1 |
MPA
| Maryland and Pennsylvania Railroad | 1 |
MR
| McCloud Railway Company | 1 |
MRL
| Montana Rail Link | 1 |
MSDR
| Knoxville & Holston River Railroad | 2 |
MTW
| Marinette Tomahawk & Western | 1 |
NAR
| Northern Alberta Railways | 2 |
NdeM
| NDEM | 2 |
NOKL
| Northwestern Oklahoma | 1 |
NP
| Northern Pacific | 2 |
NS
| Norfolk Southern | 6 |
NSL
| St. Lawrence and Raquette River Railroad | 2 |
NW
| Norfolk & Western | 3 |
NYC
| New York Central | 2 |
NYSW
| New York Susquehanna & Western | 1 |
PC
| Penn Central | 1 |
PCA
| Penn Central | 1 |
PGE
| Pacific Great Eastern | 2 |
PICK
| Pickens Railway | 1 |
PLE
| Pittsburgh & Lake Erie | 2 |
PRR
| Pennsylvania Railroad | 3 |
PW
| Providence and Worcester | 2 |
RBOX
| Railbox Company | 5 |
RDG
| Reading Railroad | 1 |
RFP
| Richmond Fredericksburg & Potomac | 1 |
RI
| RI | 1 |
SAL
| Seaboard Air Line | 1 |
SCFE
| South Central Florida Express Incorporated | 6 |
SCL
| Seaboard Coast Line | 3 |
SGLR
| Seminole Gulf | 1 |
SJL
| St Johnsbury & Lamoille County RR | 1 |
SLSF
| Saint Louis-San Francisco | 3 |
SOO
| Soo Line | 1 |
SOU
| Southern | 6 |
SP
| Southern Pacific | 3 |
SRC
| Strasburg Railroad | 1 |
SRNJ
| Southern Railroad Company of New Jersey | 2 |
SSW
| St Louis Southwestern (Cotton Belt) | 2 |
TASD
| Terminal Alabama State Docks | 1 |
TBOX
| TTX Company | 11 |
TP
| Texas & Pacific | 1 |
TRMX
| The Railroad Museum-TRM Industries | 1 |
UP
| Union Pacific Railroad Company | 5 |
VSO
| Valdosta Southern | 1 |
VTR
| Vermont Railway | 2 |
WC
| Wisconsin Central | 1 |
WM
| Western Maryland | 2 |
WPYR
| White Pass & Yukon Route | 3 |