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AA	Ann Arbor Railroad
ABL	Alameda Belt Line
AC	Algoma Central Railway
ACE	Altamont Corridor Express
ACL	Atlantic Coast Line
ACWR	Aberdeen, Carolina & Western Railway
ACY	Akron, Canton & Youngstown Railroad 
ADBF	Adrian & Blissfield Rail Road
ADIR	Adirondack Railway
ADMX	ADM Transportation (Archer-Daniels-Midland, Lessee)
ADN	Ashley, Drew & Northern Railway
AEC	Atlantic & East Carolina Railway
AERC	Albany & Eastern Railroad
AFRR	Amador Foothills Railroad
AGCR	Alamo Gulf Coast RR
AGR	Alabama and Gulf Coast Railway 
AHW	Ahnapee & Western Railway
AJ	Alma & Jonquieres Railway
AKDN	Acadiana Railway
AKMD	Arkansas Midland RR
AL	Almanor Railroad
ALM	Arkansas, Louisiana Missouri Railroad
ALS	Alton & Southern Railway
ALTX	Alter Trading Co (Southern Illinois Railcar Co)
ALY	Allegheny Railroad (Allegheny & Eastern Railroad)
AM	Arkansas & Missouri Railroad
AMC	Amador Central Railroad
AMR	Arcata & Mad River Railroad
AMTK	Amtrak
AN	Apalachicola Northern Railroad
ANY	Athabasca Northern Ry
AO	Appalachian & Ohio Railroad
AOK	Arkansas-Oklahoma Railroad
APA	Apache Railway
APHX	Apache Powder/ Apache Nitrogen Products
APNC	Appanoose County Community Railroad
APXX	Alberta Prairie Railway Excursions
AR	Aberdeen & Rockfish
ARA	Arcade & Attica Railroad
ARM	Arizona RR Museum
ARN	Alberta RailNet
ARR	Alaska Railroad
ARZC	Arizona & California Railroad
ASAB	Atlanta & St. Andrews Bay Railway
ASDX	Allied Services
ASML	Atlanta, Stone Mountain & Lithonia Railway
ASRY	Ashland Railway
ATLT	AT&L; Railroad
ATSF	Atchison, Topeka & Santa Fe Railroad
ATW	Atlantic & Western Railway
AUNW	Austin & Northwestern Railroad
AWP	Atlanta & West Point Railroad
AWRR	Austin Western Railroad
AZCR	Arizona Central Railroad/ Verde Canyon Ry
AZER	Arizona Eastern RR
BAP	Butte, Anaconda & Pacific Railway
BAM	Bamberger RR
BAR	Bangor & Aroostook
BART	Bay Area Rapid Transit
BAYL	The Bay Line Railroad
BCER	British Columbia Electric Railway
BCH	British Columbia Hydro & Power Authority
BCLR	Bay Colony Railroad
BCOL	BC Rail Ltd.
BCVX	TransLink (West Coast Express)
BDLX	Big Dog Lines
BDTL	Ballard Terminal
BDW	Bighorn Divide & Wyoming RR (Bad Water Line)
BGCM	Bountiful Grain & Craig Mountain RR
BHCR	Black Hills Central
BJRR	Baja California Railroad
BJRY	Burlington Junction Railway
BLA	Baltimore & Annapolis Railroad
BLE	Bessemer & Lake Erie Railroad
BLMR	Blue Mountain Railroad
BLOL	Bloomer Shippers Connecting Railroad
BLR	Blacklands RR
BM	Boston & Maine Corporation
BMH	Beaufort & Morehead Railway
BMLP	Black Mesa & Lake Powell
BMRG	Blue Mountain and Reading Railroad
BMS	Berlin Mills Railway
BN	Burlington Northern Railroad
BNG	Blackwell Northern Gateway RR
BNML	Burlington Northern Santa Fe Manitoba
BNSF	Burlington Northern Santa Fe
BO	Baltimore & Ohio Railroad
BOCT	Baltimore & Ohio Chicago Terminal Railroad
BPRR	Buffalo & Pittsburgh Railroad Inc.
BRC	Belt Railway Company of Chicago
BRR	Battle River Ry
BRW	Black River & Western Corp.
BS	Birmingham Southern Railroad
BSOR	Buffalo Southern Railroad Inc.
BTRC	Boundary Trail Ry
BUGX	Bruggere and Monson (Dieselmotive Co)
BVRR	Boise Valley RR
BVRY	Brandywine Valley Railroad
BYCX	Battleground, Yacolt & Chelatchie Prarie
CA	Chesapeake & Albemarle Railroad
CAD	Cadiz Railroad
CAGY	Columbus & Greenville Railway
CALA	Carolina Southern Railroad
CANX	CANAC International
CBC	Chemin de fer Baie des Chaleurs
CBCX	Columbia Business Center
CBGR	Council Bluffs Railway
CBL	Conemaugh & Black Lick Railroad
CBNS	Cape Breton & Central Nova Scotia
CBOA	Council Bluffs & Ottumwa Ry
CBQ	Chicago, Burlington & Quincy
CBRL	Coos Bay Rail Link
CBRW	Columbia Basin Railroad
CBRY	Copper Basin Railway
CC	Chicago, Central & Pacific Railroad
CCC	Chehalis-Centralia Railroad
CC&O;	Carolina, Clinchfield & Ohio
CCCL	Connecticut Central Railroad
CCCR	Cape Cod Central Railroad
CCET	Cincinnati East Terminal
CCGX	Cando Contracting
CCKY	Chattooge & Chickamauga Railway
CCPR	Chelatchie Prairie Railroad
CCRL	Cleveland Commercial RR
CCT	Central California Traction
CDAC	Canadian American Railroad
CDR	Cape Cod Central
CEI	Chicago & Eastern Illinois
CEMR	Central Manitoba Railway
CERA	Central Railroad of Indianapolis
CFC	Chemin de fer Charlevoix
CFM	Chemin de fer de la Matepedia
CFNR	California Northern Railroad
CFWR	Caney Fork and Western Railroad
CG	Central of Georgia
CGT	Canada & Gulf Terminal Railway
CGW	Chicago Great Western
CHWE	Chehalis Western RR
CIC	Cedar Rapids & Iowa City Railway (Crandic) 
CIM	Chicago & Illinois Midland Railway
CIND	Central Railroad of Indiana
CIRR	Chattahoochee Industrial Railroad
CKRY	Central Kansas Railway
CKSO	Condon, Kinzua & Southern Railroad
CLC	Columbia & Cowlitz Railway
CLK	Cadillac & Lake City
CLNA	Carolina Coastal Railway
CLP	Clarendon & Pittsford Railroad
CLSL	Columbia & Silver Creek Railroad
CM	Central Montana Rail
CMER	Curtis, Milburn & Eastern Railroad
CMNW	Chicago Missouri & Western Railway
CMO	Chicago, St Paul, Minneapolis & Omaha
CMQ	Central Maine & Quebec Railway
CN	Canadian National Railway
CNJ	Central Railroad of New Jersey
CNW	Chicago & Northwestern
CO	Chesapeake & Ohio Railway
COE	Colorado &	Eastern
COER	Crab Orchard & Egyptian Railroad
COP	City of Prineville Railway
CORP	Central Oregon & Pacific Railroad
CP	Canadian Pacific Railway
CPDR	Carolina Piedmont Railroad
CPLT	Camino, Placerville & Lake Tahoe Railroad
CR	Conrail
CRGX	Cargill
CRIP	Chicago, Rock Island & Pacific
CRL	Chicago Rail Link
CRLX	Conrail Leasing
CRR	Clinchfield Railroad
CRRX 	Canon City & Royal Gorge Railroad
CS	Colorado & Southern
CSCD	Cascade & Columbia River Railroad
CSOR	Connecticut Southern Railroad
CSP	Camas Prairie Railroad
CSRM	California State RR Museum
CSS	Chicago South Shore & South Bend Railroad 
CSXT	CSX Transportation
CTN	Canton Railroad
CTRW	Carlton Trail Railway
CTS	Cumbres & Toltec Scenic
CUVA	Cuyahoga Valley Railway
CV	Central Vermont
CVR	Cimarron Valley
CW	Coloroado & Wyoming Railway
CWEX	Commonwealth Edison
CWL	Cornwall Railroad
CWP	Chicago, West Pullman & Southern Railroad
CWR	California Western Railroad
CWRL	Central Western Railway
CWRY	Commonwealth Railway 
CWW	Columbia & Walla Walla Railroad
CWWR	Chehalis Western Railroad
CYDX	Conrad Yelvingston Distributors
CZRY	Carrizo Gorge Ry
DAIR	D&I; Railroad
DAKR	Dakota Rail
DEEX	Detroit Edison
DGNO	Dallas, Garland & Northeastern Railroad
DH	Delaware and Hudson Railway
DL	Delaware - Lackawanna Railroad
DLCR	Delaware Coast Line Railroad
DLMX	Daylight Locomotives & Machine Works
DLSX	Diesel Supply Company
DLW	Delaware, Lackawanna & Western
DM	Detroit & Mackinac Railway
DME	Dakota, Minnesota & Eastern Railroad
DMIR	Duluth, Missabe & Iron Range Railway
DMVW	Dakota, Missuri Valley & Western Railroad
DNE	Duluth & Northeastern Railroad
DOE	Dept of Energy
DQE	De Queen & Eastern Railroad
DR	Dardanelle & Russellville Railroad
DRGW	Denver & Rio Grande Western Railroad
DRI	Davenport, Rock Island & North Western Railroad
DRIR	Denver Rock Island Railroad
DSNG	Durango & Silverton Narrow Guage
DSRC	Dakota Southern Railway
DTI	Detroit, Toledo & Ironton
DTS	Detroit & Toledo Short Line
DV	Delaware Valley Railway
DVR	Devco Railway
EACH	East Camden & Highland RR 
EARY	Eastern Alabama Railway
EBT	East Broad Top 
ECDC	ECDC Environmental
ECRX	Econo-Rail Corp
EE	Ellis & Eastern
EEC	East Erie Commercial Railroad
EFRX	Eastern Terminal
EFVM	Estrada de Ferro Vitoria-Minas 
EIRR	Eastern Idaho Railroad
EJE	Elgin, Joliet & Eastern Railway
EL	Erie Lackawanna
ELS	Escanaba & Lake Superior Railroad
EMRR	Eagle Mountain RR
EMRY	Eastern Maine Railway
EN	Canadian Pacific Railway
ENR	Esquimalt & Nanaimo Railway
EPTC	East Portland Traction
ESHR	Eastern Shore Railroad
ESLJ	East St. Louis Junction Railroad
ESWR	Escalante Western (also WFAX)
ETL	Essex Terminal Railway
EUKA	Eureka Southern Railroad
EWG	Eastern Washington Gateway
FAPR	Floydada & Plainview Railroad
FCEW	Florida Central Railroad
FCG	Fernwood Columbia & Gulf
FCIN	Frankfort & Cincinnati Railroad
FCP	Ferrocarril Chihuahua al Pacifico
FCR	Fulton County Railway
FCRR	should possibly be FCEW
FDDM	Fort Dodge, Des Moines & Southern Railway
FEC	Florida East Coast Railway
FGLK	Finger Lakes Railway 
FGS	Fruit Growers Supply
FL	Family Lines
FMRC	Farmrail
FNM	Ferrocarriles Nacionales de Mexico
FP	Fordyce and Princeton Railroad
FRR	Falls Road Railroad
FRVR	Fox River Valley Railroad
FRW	Feather River & Western (WPRM)
FRY	Fore River Railway
FSR	Fort Smith Railroad
FTRX	Foster Townsend Rail Logistics
FURX	First Union Rail
FUS	Ferrocarriles Unidos del Sureste
FVW	Fox Valley & Western
FWCR	Florida West Coast Railroad
FWD	Fort Worth & Denver Railway
FWRD	Fairmont & Western Railroad
FWRY	Fillmore & Western Ry
FXE	Ferromex
GA	Georgia Railroad
GANO	Georgia Northern Railway
GBW	Green Bay & Western Railroad
GC	Georgia Central Railway
GCRY	Grand Canyon Ry
GCSR	Gulf, Colorado & San Saba Railway
GCW	Garden City Western Railway
GDLK	Grand Elk Railroad 
GENX	General Electric Railcar Services
GEXR	Goderich-Exeter Railway
GF	Georgia & Florida Railway
GFC	Grand Falls Central Railway
GFR	Grand Forks Railway
GFRR	Georgia & Florida Railroad
GGRM  	Golden Gate RR Museum
GLR	Georgetown Loop RR
GLSR	Gloster Southern Railroad
GMD	General Motors Diesel Division
GMO	Gulf, Mobile & Ohio
GMRC	Green Mountain Railroad
GMRY	Great Miami & Scioto Railway
GMSR	Gulf & Mississippi Railroad
GN	Great Northern
GNRR	Georgia Northeastern Railroad
GNWR	Genesee & Wyoming Railroad
GOOS    Goose Lake Railway
GOT	GO Transit
GR	Grand Rapids Eastern Railroad
GRN	Greenville & Northern Railway
GRNW	Great Northwest RR
GRR	Georgetown Railroad
GRWR	Great Walton Rail
GRYR	Grenada Railway 
GSMR	Great Smokey Mountains RR
GSR	Great Sandhills Ry
GSRX	Golden Spike Railroad Services
GSWR	Georgia Southwestern Railroad
GTIS	Guilford Transportation Industries
GTRA	Golden Triangle Railroad
GTW	Grand Trunk Western Railroad
GU	Grafton and Upton Railroad
GWR	Great Western Railway (Colorado)
GWRC	Georgia Woodland Railroad
GWRS	Great Western Railway (Saskatchewan)
GWWD	Greater Winnipeg Water District Railway
GWWR	Gateway Western Railway
HATX	Helm - Atlantic Associates
HB	Hampton & Branchville Railroad
HBL	Harbor Belt Line
HBRY	Hudson Bay Railway
HBT	Houston Belt & Terminal Railway
HCRY	Huron Central Railroad
HCYR	Horry County Railway
HESR	Huron & Eastern Railway
HI	Hamersley Iron
HLCX	Helm Financial
HLSC	Hampton Railway
HMCR	Huntsville & Madison County Railroad
HN	Hutchinson & Northern Railway
HOG	Heart of Georgia RR
HOS	Hoosier Southern Railroad
HPTD	High Point, Thomasville & Denton Railroad
HS	Hartford & Slocomb Railroad
HSMR	Historic St Marys RR
HSRR	Hardin Southern Railroad
HVRX	Heber Valley RR
IAIS	Iowa Interstate Railroad
IANR	Iowa Northern
IANW	Iowa Northwestern RR
IARR	Iowa River RR
IC	Illinois Central Railroad
ICE	Iowa Chicago & Eastern RR
ICG	Illinois Central Gulf
IHB	Indiana Harbor Belt Railroad
IHRC	Indiana Hi-Rail Corp.
IMRL	I&M; Rail Link
IMRR	Illinois & Midland Railroad
INOH	Indiana & Ohio Railroad, Inc.
INPR	Idaho Northern & Pacific Railroad
INRD	Indiana RR
IOCR	Indiana & Ohio Central Railroad
IORY	Indiana & Ohio Railway
IR	Illinois Railnet
IRRC	Iowa Railroad
IRRS	International Railroad Systems
ISCX	Inman Service Company (ISC)
ISR	Iowa Southern Railroad 
ISRR	Indiana Southern Railroad
ITC	Illinois Terminal
IW	Intermountain Western
JJRD	J&J; Railroad
JPBX	Joint Powers Board (Caltrain)
JTFS	Juniata Terminal
JXPT	Jaxport Terminal Railway Co.
KBSR	Kankakee, Beaverville & Southern Railroad
KCCX	Kennecott Utah Copper Corporation
KCNW	Kelley's Creek & Northwestern Railroad
KCS	Kansas City Southern Railway
KCT	Kansas City Terminal
KEWH	Kewash Railroad
KFR	Kettle Falls International
KGTR	Kingman Terminal RR
KIT	Kentucky & Indiana Terminal RR
KJRY	Koekuk Junction Railway
KMR	Kettle Moraine Scenic Railway 
KNOR	Klamath Northern Railway
KPR	Kelowna Pacific Railway
KRC	Keewatin Ry Co
KRR	Kiamichi Railroad
KSW	Kansas Southwestern Railway
KWT	KWT Railway, Inc.
KYLE	Kyle Railroad
KXHR	Knoxville ∓ Holston River Railroad 
LAJ	Los Angeles Junction Ry
LAL	Livonia, Avon & Lakeville Railway
LBR	Lowville & Beaver River Railroad
LC	Lancaster & Chester Railway
LCR	Lake County Railroad
LCRI	Long Creek RR
LCSR	Leadville Colorado & Southern
LDRR	Louisiana & Delta Railroad
LEF	Lake Erie, Franklin & Clarion Railroad
LGIX	Lincoln Grain
LHR	Lehigh & Hudson River Railway
LHRR	Longhorn Railway
LI	Long Island Rail Road
LINC	Lewis & Clark Railway
LIRC	Louisville & Indiana Railroad
LLPX	Locomotive Leasing Partners
LLR	Lake Line RR
LMR	Last Mountain Ry
LMT	Louisiana Midland Transport
LMX	LMX
LN	Louisville & Nashville
LNW	Louisiana & North West Railroad
LPN	Longview Portland & Northern Railway
LRCX	Livingston Rebuild Center
LRS	Laurinburg & Southern Railroad
LRWN	Little Rock & Western Railway
LRY	Lake Railway
LS	Luzerne & Susquehanna Railway
LSI	Lake Superior & Ishpeming Railroad
LSRC	Lake States Railway
LT	Lake Terminal Railroad
LTCO	Lakeside Transportation
LTEX	Larry's Truck Electric
LTVX	LTV Steel Co.
LUN	Ludington and Northern Railway
LV	Lehigh Valley Railroad
LVAL	Lackawanna Valley Railroad
LVRC	Lamoille Valley Railroad
LVRR	Lycoming Valley Railroad
LWR	Lakeland & Waterways Railway
LWRY	Lake Whatcom Ry
LXOH	Lexington & Ohio Railroad
LXVR	Luxapalila Valley Railroad Inc.
MAA	Magma Arizona Railroad Company
MACO	McCormick, Ashland City & Nashville Railroad Co., Inc.
MARC	Maryland Area Rail Commuter
MB	Meridian & Bigbee Railroad
MBTA	Massachussetts Bay Transit Authority
MC	Maine Coast Railroad 
MCER	Massachusetts Central Railroad
MCR	McCloud Railway
MCTA	Minnesota Central Railroad
MDDE	Maryland & Delaware Railroad
MDT	Mountain Diesel Transportation
MDW	Minnesota, Dakota & Western Railway
ME	Morristown & Erie Railway
MEC	Maine Central Railroad
MEDF	Medco, Medford Corporation RR
MET	Modesto & Empire Traction
MGA	Monongahela Railway
MH	Mt. Hood Railroad
MHCO	Marquette & Huron Mountain Railroad
MHWA	Mohawk Adirondack & Northern Railroad
MIDH	Middletown & Hummelstown Railroad
MIGN	Michigan Northern Railway
MILW	Chicago, Milwaukee, St. Paul & Pacific Railroad (Milwaukee Road)
MIRS	Mare Island Rail Service
MJ	Manufacturers Junction Railway
MKCX	Morrison Knudsen
MKT	Missour-Kansas-Texas (Katy)
MMA	Montreal Maine & Atlantic Railway 
MMID	Maryland Midland Railway
MMRR	Mid-Michigan Railroad
MMT	Mission Mountain Railroad 
MNA	Missouri & Northern Arkansas Railroad
MNCW	Metro-North Railroad 
MNL	Mountain Laurel Railroad
MNN	Minnesota Northern Railroad
MNNR	Minnesota Commercial Railway
MNR	Mojave Northern
MNRR	Modoc Northern RR
MNS	Minneapolis, Northfield & Southern Railway
MNVA	MNVA Railroad
MOC	Missouri Central
MON	Monon
MOV	Moshassuck Valley Railroad
MP	Missouri Pacific
MPA	Maryland & Pennsylvania Railroad
MQRR	Mountain Quarries RR
MR	McCloud River Railroad
MRL	Montana Rail Link
MRR	Mid-Atlantic Railroad
MRS	Manufacturers Ry
MRSR	Mt Rainier Scenic
MS	Michigan Shore Railroad
MSCI	Mississippi Central Railroad
MSE	Mississippi Export Railroad
MSN	Meeker Southern 
MSO	Michigan Southern Railroad
MSRC	MidSouth Rail
MSTL	Minneapolis & St. Louis Railroad
MSV	Mississippi & Skuna Valley Railroad
MSWY	Minnesota Southern Ry
MTFR	Minnesota Transfer Railway
MVPX	MVPX
MVT	Mount Vernon Terminal Railway
MWR	Muncie & Western Railroad
MWRL	Mololla Western Railway
MWRR	Montana Western Railway
MWRY	Mineral Wells & Eastern Railroad
NACR	Nashville & Ashland City Railroad
NAP	Narragansett Pier Railroad
NAR	Northern Alberta Railways
NBEC	New Brunswick East Coast Railway
NBER	Nittany & Bald Eagle Railroad
NBSR	New Brunswick Southern Railway
NCNG	Nevada County Narrow Guage
NCRC	Nebraska Central Railroad 
NCRR	North Coast Railroad
NCVA	North Carolina & Virginia Railroad
NDM	Ferrocarriles Nacionales de Mexico
NE	Northern Electric
NECR	New England Central Railroad
NEGS	New England Southern Railroad
NEKM	Northeast Kansas & Missouri 
NENE	Nebraska Northeastern
NERR	Nashville & Eastern Railroad
NEZP	Nezperce Railroad
NH	New York, New Haven & Hartford Railroad (New Haven)
NHVT	New Hampshire & Vermont Railroad
NIS	Nevada Industial Switch
NKCR	Nebraska Kansas Colorado Railnet
NKP	Nickel Plate Road
NLG	North Louisiana & Gulf Railroad
NMRR	Navajo Mine RR
NMRX	Rail Runner Express
NN	Nevada Northern Railway
NN	Northern Nevada Railroad
NNRM	Nevada Northern RR Museum
NOGC	New Orleans & Gulf Coast 
NOKL	Northwestern Oklahoma Railroad
NOLR	New Orleans Lower Coast Railroad
NOPB	New Orleans Public Belt Railroad
NP	Northern Pacific
NPBL	Norfolk & Portsmouth Belt Line 
NPPR	NezPerce & Pomeroy RR
NPPX	Nebraska Public Power
NPRM	Northern Pacific Railroad Museum
NPT	Northern Pacific Terminal
NRHS	National Railway Historical Society
NRI	Nebkota Railway
NRR	Nobles Rock Railroad
NS	Norfolk Southern
NSRM	Nevada State Railroad Museum
NSTX	Nucor Steel
NSWR	Nelson Southwestern Railroad
NVR	Napa Valley Railroad
NW	Norfolk & Western
NWP	Northwestern Pacific Railroad
NYA	New York & Atlantic Railway
NYC	New York Central
NYOW	New York, Ontario & Western
NYSW	New York, Susquehanna & Western Railroad
OAE	Oakland, Antioch & Eastern
OAR	Old Augusta Railroad
OCE	Oregon California & Eastern Railway
OCEX	Oregon Coastline Express
OCRR	Ottawa Central Railway
OCTR	Octoraro Railway
OE	Oregon Electric
OERM	Orange Empire Railway Museum
OERR	Oregon Eastern 
OGEE	Ogeechee Railway
OGRE	Oakland Global Rail Enterprises
OHCR	Ohio Central Railroad
OHRY	Owego & Hartford Railway
OKAN	Okanagan Valley Railway
OKRX	Oklahoma Railway Museum ltd
OLO	Ontario L'Original Railway
OLYR	Olympic Railroad
OMID	Ontario Midland Railroad
OMLX	OmniTrax
ONT	Ontario Northland Railway
ONW	Oregon & Northwestern Railroad
OPE	Oregon Pacific & Eastern Railway
OPR	Oregon Pacifc Railroad
OSRX	Ontario Southland Railway
OTR	Oakland Terminal 
OTVR	Otter Tail Valley Railroad
OUCH	Ouachita Railroad
OVRR	Ozark Valley RR
OWTX	Oneida & Western
OYLO	Olympia & Belmore RR
PAL	Paducah & Louisville Railroad
PALCo	Pacific Lumber Co
PAMR	Pittsburgh Allegheny & McKees Rocks
PAW	Pacific Wilderness Ry
PBNE	Philadelphia, Bethlehem & New England
PC	Penn Central
PCC	Palouse River & Coulee City Railway
PCHR	Port Colborne Harbour Railway
PCM	Pena Colorada Mexico
PCN	Point Comfort & Northern Railway
PCY	Pittsburgh, Chartiers & Youghiogheny
PDC	Prarie Dog Central
PE	Pacific Electric
PGE	Pacific Great Eastern
PHDX	Phelps-Dodge
PHL	Pacific Harbor Line
PID	Peterson Industrial Depot
PIR	Pittsburgh Industrial Railroad
PIR 	Pacific Imperial Railroad 
PLA	Pacific Locomotive Assoc.
PLE	Pittsburgh & Lake Erie Railroad
PN	Piedmont & Northern Railway
PNCX	Precision National
PNR	Panhandle & Northern Railroad
PNW	Prescott & Northwestern Railroad
PNWR	Portland & Western Railroad
POTB	Port of Tillamook Bay Railroad
POV	Pittsburgh & Ohio Valley Railway
POVA	Pend Oreille Valley Railroad
PREX	Pioneer Railroad Equipment
PRR	Pennsylvania Railroad
PRSL	Pennsylvania-Reading Seashore Lines
PRT	Parr Terminal Railroad
PRTD	Portland Traction
PS	Pittsburg & Shawmut Railroad
PSAP	Puget Sound & Pacific Railroad
PSR	Petaluma & Santa Rosa
PSRM	Pacific Southwest Railroad Museum
PSRR	Pacific Sun RR
PT	Peninsula Terminal
PTRC	Portland Terminal Railroad
PTRR	Port Townsend Railroad or Portland Terminal RR
PVJR	Portland Vancouver Junction RR
PW	Providence and Worcester Railroad
PWJ	West Jersey Railroad
QBT	Quincy Bay Terminal
QCM	Cartier Railway
QGRY	Quebec-Gatineau Railway
QIT	QIT - La Compagnie de Chemin de Fer de la Riviere Romaine
QNSL	Quebec North Shore & Labrador Railway
QRC	Quebec Railway Corporation
QRR	Quincy Railroad
QS	Quebec Southern
RARW	Rarus Railway
RBMN	Reading, Blue Mountain & Northern Railroad
RCBT	Roaring Camp & Big Trees
RCPE	Rapid City Pierre & Eastern RR
RCRY	Raritan Central Ry
RDG	The Reading Company
RFRX	Rick Franklin Corp.
RI	Chicago, Rock Island & Pacific
RLGN	Mackenzie Northern Railway
RLHH	Southern Ontario Railway
RLK	Railink or Ottawa Valley Railway
RMRR	Rocky Mountain Railcar & Railroad
RMRX	Rocky Mountaineer Railtours
ROMP	Roots of Motive Power
RPRC	Richmond Pacific
RRRR	Rock & Rail
RRVW	Red River Valley & Western Railroad
RS	Roberval & Saguenay Railway
RSM	Railroad Switching Service of Missouri
RTEX	RailTex or Rail Trusts Equipment Inc
RV	Rahway Valley
RVT	Rogue Valley Terminal RR
SAL	Seaboard Air Line
SAR	Savage Alberta Ry
SAV	Sacramento Valley RR
SB	South Buffalo Railway
SBD	Seaboard System Railroad
SBG	Savage Bingham & Garfield Railroad
SBVR	South Branch Valley Railroad
SCAX	Metrolink
SCBT	Santa Cruz, Big Trees & Pacific
SCEX	Southern California Edison
SCL	Seaboard Coast Line
SCMB	Santa Cruz & Monterey Bay RR
SCRF	South Carolina Central Railroad
SCRR	Southern California RR
SCRX	Santa Clarita Railway
SCT	Sioux City Terminal Railway 
SCTR	South Central Tennessee Railroad
SCXY	St. Croix Valley Railroad
SDAE 	San Diego & Arizona Eastern
SDIV	San Diego & Imperial Valley
SDIY	San Diego & Imperial Valley Railroad
SDNR	San Diego Northern (Coaster)
SDRX	Sound Transit (Sounder)
SDWG	South Dakota Wheat Growers
SECX	Southeast Coal (GE Railcar Services)
SEKR	Southeast Kansas Railroad Company 
SEMT	Southeastern Michigan Transportation Authority
SEPT	Southeastern Pennsylvania Transportation Authority
SERA	Sierra Northern Railroad
SFB	San Francisco Belt (State Belt)
SFBR	San Francisco Bay Railroad
SFNV	San Francisco Napa Valley
SFS	Santa Fe Southern
SGVY	Saginaw Valley Railway
SH	Steelton & Highspire Railroad
SI	Spokane International
SJVR	San Joaquin River RR
SKOL	South Kansas & Oklahoma Railroad
SL	Salt Lake City Southern Railroad
SLA	St. Lawrence & Atlantic
SLAL	South Plains Lamesa Railroad
SLC	San Luis Central Railroad
SLGG	Sidney & Lowe Railroad 
SLGW	Salt Lake, Garfield & Western
SLQ	St. Lawrence & Atlantic Railroad (Quebec)
SLRG	San Luis & Rio Grande RR
SLSF	St. Louis - San Francisco (Frisco)
SLWC	Stillwater Central Railroad 
SM	St. Marys Railroad
SMA	San Manuel Arizona Railroad
SMNR	Southern Manitoba Railway
SMRR	Sisseton Milbank Railroad
SMV	Santa Maria Valley Railroad
SN	Sacramento Northern Railway
SNC	Saratoga & North Creek Ry 
SNCT	Seattle & North Coast Railroad
SNR	Sunflour Railroad 
SOO	Soo Line Railroad
SOU	Southern Railway
SOWDT	Spirit of Washington Dinner Train
SP	Southern Pacific
SPS	Spokane, Portland & Seattle
SPSR	San Pedro & Southwestern Railroad
SQVR	Sequatchie Valley Railroad
SRC	Strasburg Railroad
SRN	Sabine River & Northern Railroad
SRR	Sierra RR
SRRR	Swan Ranch RR
SRY	Southern Railway of British Columbia or Southern Rail Link
SSDK	Savannah State Docks Railroad
SSOR	Sisseton Southern Railway
SSR	Stewart Southern Ry
SSRR	Sacramento Southern RR
SSTX	Simpson Timber or Schnitzer Steel
SSW	St. Louis Southwestern (Cotton Belt)
ST	ST Rail System
ST	Springfield Terminal Railway
STE	Stockton Terminal & Eastern Railroad
STER	St. Thomas and Eastern Railway
STMA	St. Maries River Railroad
SVE	Sacramento Valley & Eastern
SVGX	Savage Inc
SVI	Southern Railway of Vancouver Island
SVRY	Sumpter Valley Railway
SW	Southwestern RR
SWGR	Seagraves, Whiteface & Lubbock Railroad
SWKR	San Pedro & Southwestern Railway
SWP	Southwestern Pennsylvania Railroad
SWPC	Southwestern Portland Cement
TAG	Tennessee, Alabama & Georgia Railroad
TBER	Terre Haute, Brazil & Eastern
TC	Tennessee Central Railroad
TCGB	Tucson, Cornelia & Gila Bend Railroad
TCRY	Tri-City  & Olympia Railroad
TCWR	Twin Cities & Western Railroad
TE	Tacoma Eastern Railway
TFM	Transportacion Ferroviaria Mexicana 
THB	Toronto, Hamilton & Buffalo
TIBR	Timber Rock Railroad 
TM	Texas Mexican Railway
TMBL	Tacoma Municipal Belt Line
TNER	Texas Northeastern Railroad
TNHR	Three Notch Railroad
TNMR	Texas-New Mexico Railroad
TNO	Texas & New Orleans Raiload
TOE	Texas, Oklahoma & Eastern Railroad
TOR	RaiLink Canada
TOV	Tooele Valley Railway
TP	Texas & Pacific Railway
TPW	Toledo, Peoria & Western Railroad
TR	Thunder Rail
TRC	Trona Railway
TRMW	Tacoma Rail
TRRR	Torch River Rail
TS	Tidewater Southern Railway
TSBY	Tuscola & Saginaw Bay Railway 
TSRR	Tennessee Southern Railroad
TSWR	Toppenish Simcoe & Western Railroad
TTIS	Transkentucky Transportation Railroad
TWRR	Turlock Western
TWRY	Tradewater Railway
TVA	Tennesee Valley Authority
TYBR	Tyburn Railroad
TXR	Texas Rock Crusher 
UCIR	Union County Industrial Railroad
UCRY	Utah Central Ry
UMP	Upper Merion & Plymouth Railroad
UO	Union Railroad of Oregon
UP	Union Pacific Railroad
URR	Union Railroad
USA 	United States Army
USAX	United States Air Force
USMC	United States Marine Corp
USN	United States Navy
USRR	Utah Southern
USS	United States Steel
USSC	United States Sugar
UTAH	Utah Railway
VAMD	Virginia & Maryland
VB	Van Buren Bridge
VC	Virginia Central
VCRR	Ventura County Railroad
VCY	Ventura County Railway
VE	Visalia Electric
VIA	VIA Rail
VR	Valdosta Railway
VS	Valley & Siletz Railroad
VSO	Valdosta Southern Railroad
VSR	V&S Railway 
VSRR	Virginia Southern Railroad
VT	Virginia & Truckee
VTR	Vermont Railway
WA	Western Railway of Alabama
WAB	Wabash Railway
WAMX	Webb Asset Management (WATCO)
WC	Wisconsin Central
WCLR	Waccamaw Coast Line Railroad
WCRC	Washington Central Railroad
WCTR	WCTU Railway
WE	Wheeling & Lake Erie
WFS	West Isle Line
WGCR	Wiregrass Central Railroad
WGR	Willamina & Grand Ronde Railway
WHRC	Windsor & Hantsport Railway
WIM	Washington, Idaho & Montana Railway
WIR	Washington & Idaho Ry
WKRL	Western Kentucky Railway
WM	Western Maryland Railroad
WOHO	Wabash & Ohio Railroad
WP	Western Pacific
WPRM	Western Pacific Railroad Museum
WPRR	Willamette & Pacific Railway
WPY	White Pass and Yukon Route
WRIX	Western Rail Inc
WRL 	Washington Royal Line
WRM	Western Railway Museum
WRWK	Warwick Railway
WSCV	West Side & Cherry Valley
WSOR	Wisconsin Southern Railroad
WSYP	White Sulphur Springs & Yellowstone Park Railway
WTCX	Weyerhaeuser Timber Company
WTJR	Wichita, Tillman & Jackson Railway 
WTLC	West Texas & Lubbock Railroad
WTNN	West Tennessee Railroad
WTSE	West Shore Railroad
WURR	Wallowa Union Railroad Authority 
WVR	Willamette Valley Railway
WVRC	Wabash Valley Railroad
WVRD	Willamette Valley Railroad
WW	Winchester & Western RR
WWR	Western Washington RR
WWV	Walla Walla Valley Railway
WYCO	Wyoming & Colorado Railroad
YCR	Yakima Central RR
YMSP	Yosemite Mountain Sugar Pine
YS	Youngstown & Southern Railway
YSLR	Yolo Shortline Railroad
YSVR	Yellowstone Valley Railroad 
YVRY	Yuma Valley Ry
YVT	Yakima Valley Transportation Company
YW	Yreka Western Railroad