AA
| Ann Arbor | 1 |
ACL
| Atlantic Coast Line | 1 |
AERC
| Albany and Eastern Railroad Company | 5 |
ALM
| Arkansas Louisiana and Mississippi Railr | 1 |
AM
| Arkansas & Missouri | 1 |
AMTK
| Amtrak | 38 |
APA
| Apache Railway Company | 2 |
ARR
| Alaska Railroad | 12 |
ATSF
| Atchison Topeka & Santa Fe | 39 |
BAR
| Bangor & Aroostook | 1 |
BB
| Buckingham Branch | 2 |
BCOL
| Canadian National Railways | 15 |
BGSX
| Strata Corporation | 1 |
BN
| Burlington Northern | 61 |
BNSF
| BNSF Railway | 119 |
BO
| Baltimore & Ohio | 24 |
BPRR
| Buffalo and Pittsburgh | 3 |
BSOR
| Buffalo Southern | 1 |
BW
| BW | 1 |
CCKY
| Chattooga & Chickamauga Railway | 2 |
CERA
| Central RR of Indianapolis | 1 |
CKRY
| Central Kansas Railway Incorporated | 2 |
CMRR
| Catskill Mountain Scenic | 2 |
CN
| Canadian National Railways | 81 |
CNW
| Chicago & Northwestern | 27 |
CNZR
| Central New England | 2 |
CO
| Chesapeake & Ohio | 12 |
COP
| City of Prineville Railway | 1 |
CP
| Canadian Pacific Railway | 109 |
CR
| Conrail | 83 |
CRIP
| Chicago Rock Island & Pacific | 1 |
CRR
| Clinchfield | 4 |
CSDX
| Metropolitan Water Reclamation District of Greater Chicago | 14 |
CSX
| CSX Railroad | 32 |
CV
| Central Vermont | 1 |
DH
| Delaware & Hudson | 4 |
DLW
| Delaware Lackawanna & Western | 1 |
DME
| Dakota, Minnesota and Eastern | 1 |
DMIR
| Duluth Missabe & Iron Range | 73 |
DRGW
| Denver & Rio Grande Western | 8 |
EFA
| Estrada de Ferro Amapa | 1 |
EFVM
| Estrada de Ferro Vitoria-Minas | 3 |
EJE
| Elgin Joliet and Eastern | 3 |
FEC
| Florida East Coast | 7 |
FIMX
| Franklin Industrial Minerals | 1 |
FSQ
| FSQ | 1 |
FWD
| Fort Worth & Denver | 2 |
FXE
| Ferromex | 2 |
GACX
| General American Marks Company | 1 |
GC
| Georgia Central | 1 |
GCCX
| General American Marks Company | 1 |
GNBC
| Grainbelt Corporation | 2 |
GWWR
| Gateway Western | 2 |
HLMX
| Helm Financial Corporation | 7 |
HRRC
| Housatonic Railroad Company | 1 |
HVRX
| Heber Valley Historic Railroad | 1 |
HVS
| HVS | 1 |
HVSR
| Hocking Valley Scenic | 1 |
HZGX
| Herzog Contracting Corporation | 19 |
IAIS
| Iowa Interstate | 2 |
ICE
| Iowa Chicago and Eastern | 13 |
ICG
| Illinois Central Gulf | 2 |
KCC
| KCC | 1 |
KCCX
| Kennecott Utah Copper Corporation | 1 |
KCS
| Kansas City Southern | 4 |
KIWI
| KIWI | 4 |
KMC
| KMC | 2 |
KO
| Kansas & Oklahoma | 1 |
KOR
| KOR | 9 |
LBR
| Lowville and Beaver River Railroad Compa | 2 |
LGEX
| L.G. Everist Incorporated | 4 |
LI
| Long Island Rail Road Company | 4 |
LN
| Louisville & Nashville | 11 |
MBA
| MBA | 1 |
MBTA
| Massachusetts Bay Transit Authority | 3 |
MEC
| Maine Central | 9 |
MIDH
| Middletown and Hummelstown RR Company | 1 |
MILW
| Milwaukee Road | 1 |
MKCX
| Morrison Knudsen Corporation | 1 |
MNCW
| Metro-North Commuter Railroad | 9 |
MNNR
| Minnesota Commercial | 1 |
MP
| Missouri Pacific | 51 |
MRL
| Montana Rail Link | 5 |
NAUG
| Naugatuck Railroad Company | 1 |
NCRC
| Nebraska Central | 1 |
NCRR
| NCRR | 1 |
NdeM
| NDEM | 11 |
NERX
| Transportation Management Services Incorporated | 5 |
NHRR
| New Hope and Ivyland Rail Road | 1 |
NJT
| New Jersey Transit | 3 |
NJTR
| NJ Transit Rail Operations | 6 |
NM
| National Railways of Mexico | 3 |
NN
| Northern Nevada Railroad Corporation | 1 |
NOKL
| Northwestern Oklahoma | 11 |
NP
| Northern Pacific | 1 |
NS
| Norfolk Southern | 45 |
NW
| Norfolk & Western | 28 |
NYC
| New York Central | 5 |
NYSW
| New York Susquehanna & Western | 1 |
OCSR
| OCSR | 3 |
OHCR
| Ohio Central | 2 |
ONT
| Ontario Northland Railway | 2 |
PAL
| Paducah & Louisville | 4 |
PLA
| Pacific Locomotive Association [Niles Canyon Railway] | 1 |
POTB
| Port of Tillamook Bay | 1 |
POVA
| Pend Oreille Valley Railroad | 1 |
PW
| Providence and Worcester | 5 |
QNSL
| Quebec, North Shore and Labrador | 1 |
QTL
| Quincy & Torch Lake | 1 |
RFFS
| RFFS | 1 |
RFRX
| Rick Franklin Corporation | 11 |
RGAX
| RGAX | 1 |
RJCC
| R.J. Corman Railroad/Kentucky Lines | 4 |
RLK
| RailAmerica Ottawa Valley Railway | 2 |
RMGX
| Andersons - Railgroup | 1 |
SBD
| Seaboard System | 10 |
SCAX
| SOUTHERN CALIFORNIA REGIONAL RAIL AUTHORITY | 2 |
SCL
| Seaboard Coast Line | 23 |
SLR
| St Lawrence & Atlantic | 1 |
SOO
| Soo Line | 1 |
SOU
| Southern | 19 |
SP
| Southern Pacific | 3 |
SPCC
| Southern Peru Copper Corp | 1 |
SPMW
| Southern Pacific Maintenance of Way | 24 |
TCWR
| Twin Cities and Western | 5 |
TUGX
| Texas Utilities Mining Company | 1 |
UP
| Union Pacific Railroad Company | 15 |
USAX
| United States Army | 1 |
VALE
| Valley Railroad Company | 2 |
VB
| Van Buren Bridge Company (Bangor & Aroostook) | 1 |
VTR
| Vermont Railway | 2 |
WCRC
| Washington Central | 3 |
WE
| Wheeling & Lake Erie | 7 |
WISX
| Wisconsin Power and Light Company | 2 |
WNYP
| Western New York and Pennsylvania | 1 |
WPRR
| Willamette and Pacific | 5 |
WSOR
| Wisconsin & Southern | 1 |
WVRR
| Whitewater Valley Railroad | 1 |
YKRX
| York Rail | 1 |