List initials of the AAR begin with D
See the principal article: Initials of the AAR
D
- DA - Dominion Atlantic Railway; Canadian Pacific Railway
- DACX - Darling and Company; VIP Tank Services
- DAFU - Dafra Lines, SA
- DAFX - United States Department off Defense (Troop Support and Aviation Material Readiness)
- DAFZ - Dafra Lines, SA
- DAIR - D and I Railroad
- DAKR - Dakota Rail
- DAKS - Dakota Shorts Line
- DAKX - DAK Americas, LLC
- DALT - Dallas Terminal Railway
- DALZ - D and has Leasing, Inc.
- DAPX - Dairyland Power Co-operative
- DARU - Dart Line Container, Inc.
- DARZ - Intermodal Dart, Inc.
- DATU - Dart Line Container, Inc.
- DATX - DATX Associates
- DAVX - W.R. Grace and Company (Idiot. Davison Chemical Division)
- DAWX - D.A. Walmsley and Company
- DAX - Diamond Shamrock Chemicals Company; Western Chemical Corporation
- DBCX - Badische Corporation; BASF Corporation
- DBGX - Dowdle Butane Gas Company
- DBSU - Donbar Steamship Company, Inc.
- DBUX - CIT Equipment Finances Corporation
- DBWX - dB Western, Inc.
- cd. - Delray Connecting Railroad
- DCAX - Tarmac Florida, Inc.
- DCBX - DeGussa Engineered Carbons, LP
- DCCU - Dow Corning Corporation
- DCCX - McDonnell Douglas Corporation
- DCFX - International PLM, Inc.
- DCI - Of the Monks and Central Iowa
- DCIX - Danella Construction Corporation
- DCLR - Delaware Coast Line Railroad
- DCLU - Dutch Container Leasing, B.V
- DCLX - Procor, Ltd.; Dow Chemical Canada, Inc.
- DCMX - Davidson Materials Construction, Inc.
- DCON - Strait Connecting Railroad Company
- DCOU - Dow Corning Corporation
- DCPX - Dart Container Corporation off Pennsylvania
- DCRR - Dubois County Railroad
- DCSU - Delta Container Service
- DCTX - International PLM
- DDDX - Frontier Co-operative Company
- DDEX - Dupont Dow Elastomers, LLC
- DDNX - Didion, Inc.
- DEBX - Ceres AG Products
- DEEX - Strait Edison
- DEGX - the Mississippi Power Company
- DEMX - Demeter, Inc.
- DEPX - Dependable Properties, Inc.
- DETX - Strait Edison Company
- DFTX - DTE Transportation Services, Ltd.
- DGBY - Digby Truck Lines
- DGCX - Dakota Gasification Company
- DGHX - North American Chemical Company
- DGIX - D and G Enterprises, LLC
- DGNO - Dallas, Garland and Northeastern Railroad
- DH - Delaware and Hudson Railway; Canadian Pacific Railway
- DHNY - Delaware and Hudson Railway; Canadian Pacific Railway
- DHPX - Degussa Corporation
- DHRU - Den Hartogh NV
- DICX - Pure Carbonic Company
- DIIU - Intermodal Dart, Inc.
- DJBX - Gandy Dancer, Inc. (Donald J. Bertel)
- DJJX - Joseph Transportation, Inc.
- DJLX - Joseph Leasing, Ltd.
- DJMX - Daniel John Marnell
- DJPX - Joseph Transportation, Inc.
- DJRX - Joseph Transportation, Inc.
- DJTX - Joseph Transportation, Inc.
- DKPX - Duke Power Company (scale test bus)
- DKS - Doniphan, Kensett and Searcy Railway; Union Pacific Railroad
- DKUX - Exxon Mobil Corporation
- DLL - Delaware Lackawanna
- DLC - Drummond Lighterage
- DLCR - Delaware Coast Line Railroad
- DLCX - Waste Management, Inc.
- DLFX - Diversified Lease Funding, Inc.
- DLGX - Lewis Grain Company
- DLKU - Deltank, Ltd.
- DLMX - Daylight Engines and Works Machine, Inc.
- DLNW - Denver, Laramie and North Western Railroad; Great Western Railway off Colorado
- DLPX - DeGussa Canada, Ltd.
- DLRX - GE Railcar Services Corporation
- DLSX - Diesel Supply Company, Inc.
- DLTX - Flagstone L. Thornborough
- DLVX - Thiokol Corporation
- DLW - Delaware, Lackawanna and Western Railroad; Erie Lackawanna Railway ; Conrail
- DLWR - Depew, Lancaster and Western Railroad
- DLWX - D.L and W., Inc.
- DM - Lake State Railway
- DME - Dakota, Minnesota and Eastern Railroad
- DMHX - Davenport Mammoet, LLC
- DMIR - Duluth, Missabe and Iron Arranges Railway
- DMIX - WMD Transportation
- DMLX - GE Railcar Services Corporation
- DMLZ - DML Containers
- DMM - Dansville and Mount Morris Railroad
- DMU - Of the Monks Union Railway
- DMVW - Dakota, Missouri Valley and Western Railroad
- DNAX - Dana Railcare
- DNE - Duluth and Northeastern Railroad
- DOCX - Of the Canada Bridge, Inc.
- DODU - United States Department off Defense
- DODX - United States Department off Defense (Military Traffic Management Command)
- DODZ - United States Department off Defense
- DOEX - Doe Run Resources Corporation
- DOLX - Dolese Brothers Company
- DONX - Donnelly Commodities Company
- DOTX - United States Department off Transportation; Federal Railroad Administration
- DOWU - Dow Chemical Company
- DOWX - Dow Chemical Company
- DPCX - Blue Circle, Inc.
- DPDZ - Delaware and Hudson Railway
- DPGX - Tractech Systems
- DPIX - Dufour Petroleum, Inc.
- DPLX - Davenport Cement Company
- DQE - De Queen and Eastern Railroad
- DR. - Dardanelle and Russellville Railroad
- DRAX - DRAYCUTT Corporation
- DRCX - Martin Marietta Corporation
- DRDX - The Duredo Company
- DREX - ProTrade Steel Company
- DRg - Denver and Rio Grande Railroad
- DRGW - Denver and Rio Grande Western Railroad; Southern Pacific Railroad ; Union Pacific Railroad
- DRGX - Denver and Royal Gorges Railway
- DRHY - Durham Transport
- DRI - Davenport, Rock Island and North Western Railway
- DRIR - Denver Rock Island Railroad
- DRMX - Danbury Railway Museum
- DRSX - D.O.T. Rail Services, Inc.
- DRTU - Intermodal Dart, Inc.
- DRTZ - Intermodal Dart, Inc.
- DSA - Soo Line; Canadian Pacific Railway
- DSBU - Ameribrom, Inc.
- DSCX - DIFCO, Inc.
- DSDX - Pullman Leasing Company
- DSIX - Dowell Schlumberger, Inc.
- DSLX - DeGussa Corporation
- DSLZ - Intermodal Services, Inc.
- DSRC - Dakota Southern Railway
- DSRR - Delta Southern Railroad
- DSSA - Duluth, South Shore and Atlantic Railway
- DSSX - Strait Salt Company, LLC
- DT - Decatur Junction Railway
- DTCX - DTE Transportation Services, Inc.
- DTEX - To draw up Transportation Equipment (Division off To draw up Industries)
- DTI - Strait, Toledo and Ironton Railroad; Large Trunk Western Railroad; National Canadian Railway
- DTIZ - Large Trunk Western Railroad; National Canadian Railway
- DTLX - Delta Tank Line Company
- DTRR - Final Danbury Railroad; Housatonic Railroad
- SDR - Strait and Toledo Shore Line Railroad; Large Trunk Western Railroad; National Canadian Railway
- DTSL - Strait and Toledo Shore Line Railroad; Large Trunk Western Railroad; National Canadian Railway
- DTTX - Trailer card Train Corporation; TTX Corporation
- DTZZ - Direct Transit, Inc.
- DUCX - Of the Canada Bridge, Inc.
- DUFX - Duffy and Sounds, Inc.
- DUKX - Dupps Company
- DUPX - Dupont
- HAD - Denver Union Terminal Railway
- DUTC - Dallas Union Terminal
- FD - Delaware Valley Railway
- DVLX - Duval Corporation; Freeport-McRo-Ran Sulfur Company
- DVR - Devco Railway; Cape Breton Development Corporation (Coal Division); Sydney Coal Railway
- DVRU - Dover, Ltd.
- DVS - Delta Valley and Southern Railway
- DVSZ - Delta Valley and Southern Railway
- DW - Strait and Western
- DWAU - Degussa Antwerpen, NV
- DWC - Duluth, Winnipeg and Pacific Railway; National Canadian Railway
- DWCX - David Witherspoon, Inc.
- DWML - Due West Motor Line
- DWP - Duluth, Winnipeg and Pacific Railway; National Canadian Railway
- DYLX - Ronald L. Boothman Remainder Trust; Transportation Equipment
- DYNX - Dyno Nobel, Inc.
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