List of reporting marks: D

D

 * DA - Dominion Atlantic Railway; Canadian Pacific Railway
 * DACX - Darling and Company; VIP Tank Services
 * DAFU - Dafra Lines, SA
 * DAFX - United States Department of Defense (Troop Support and Aviation Material Readiness)
 * DAFZ - Dafra Lines, SA
 * DAIR - D&I Railroad
 * DAKR - Dakota Rail
 * DAKS - Dakota Short Line
 * DAKX - DAK Americas, LLC
 * DALT - Dallas Terminal Railway
 * DALZ - D and A Leasing, Inc.
 * DANX - Dana Railcare
 * DAPX - Dairyland Power Cooperative
 * DARU - Dart Container Line, Inc.
 * DARZ - Dart Intermodal, Inc.
 * DATU - Dart Container Line, Inc.
 * DATX - DATX Associates
 * DAVX - W. R. Grace and Company (Conn. Davison Chemical Division)
 * DAWX - D.A. Walmsley and Company
 * DAX - Diamond Shamrock Chemicals Company; Occidental Chemical Corporation
 * DBCX - Badische Corporation; BASF Corporation
 * DBGX - Dowdle Butane Gas Company
 * DBSU - Donbar Steamship Company, Inc.
 * DBUX - Canterra Energy, Ltd.; CIT Group/Capital Finance, Inc.
 * DBWX - DB Western, Inc.
 * DC - Delray Connecting Railroad
 * DCAX - Tarmac Florida, Inc.
 * DCBX - DeGussa Engineered Carbons, LLP
 * DCCU - Dow Corning Corporation
 * DCCX - McDonnell Douglas Corporation
 * DCFX - PLM International, Inc.
 * DCI - Des Moines 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 Construction Materials, Inc.
 * DCON - Detroit Connecting Railroad Company
 * DCOU - Dow Corning Corporation
 * DCPX - Dart Container Corporation of Pennsylvania
 * DCR - Delmarva Central Railroad
 * DCRR - Dubois County Railroad
 * DCSU - Delta Conteneur Service
 * DCTX - PLM International
 * DD - Dover and Delaware River Railroad
 * DDDX - Frontier Cooperative Company
 * DDEX - Dupont Dow Elastomers, LLC
 * DDNX - Didion, Inc.
 * DEAX - Deacero, S.A. de C.V.
 * DEBX - Ceres AG Products
 * DEEX - Detroit Edison
 * DEGX - Mississippi Power Company
 * DEMX - Demeter, Inc.
 * DEPX - Dependable Properties, Inc.
 * DETX - Detroit 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
 * DGVR - Durbin and Greenbrier Valley Railroad
 * DH - Delaware and Hudson Railway
 * DHNY - Delaware and Hudson Railway
 * DHPX - Degussa Corporation
 * DHRU - Den Hartogh NV
 * DICX - Pure Carbonic Company
 * DIIU - Dart Intermodal, Inc.
 * DJBX - Gandy Dancer, Inc. (Donald J. Bertel)
 * DJJX - The David J. Joseph Co.
 * DJLX - The David J. Joseph Co.; CIT Group/Capital Finance, Inc.
 * DJMX - Daniel John Marnell
 * DJNX - The David J. Joseph Co.
 * DJPX - The David J. Joseph Co.
 * DJRX - The David J. Joseph Co.
 * DJTX - The David J. Joseph Co.
 * DKPX - Duke Power Company (scale test cars)
 * DKS - Doniphan, Kensett and Searcy Railway; Union Pacific Railroad
 * DKUX - Exxon Mobil Corporation
 * DL - 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 Locomotives and Machine Works, Inc.
 * DLNW - Denver, Laramie and North Western Railroad; Great Western Railway of Colorado
 * DLPX - DeGussa Canada, Ltd.
 * DLRX - GE Railcar Services Corporation
 * DLSX - Diesel Supply Company, Inc.
 * DLTX - Dale L. Thornborough
 * DLVX - Thiokol Corporation
 * DLW - Delaware, Lackawanna and Western Railroad; Erie Lackawanna Railway; Norfolk Southern
 * DLWR - Depew, Lancaster and Western Railroad
 * DLWX - D.L. and W., Inc.
 * DM - Detroit and Mackinac Railway
 * DME - Dakota, Minnesota and Eastern Railroad
 * DMHX - Davenport Mammoet, LLC
 * DMIR - Duluth, Missabe and Iron Range Railway
 * DMIX - ADM Transportation
 * DMLX - GE Railcar Services Corporation
 * DMLZ - DML Containers
 * DMM - Dansville and Mount Morris Railroad
 * DMU - Des Moines Union Railway
 * DMVW - Dakota, Missouri Valley and Western Railroad
 * DNAX - Dana Railcare
 * DNE - Duluth and Northeastern Railroad
 * DOCX - Du Pont Canada, Inc.
 * DODU - United States Department of Defense
 * DODX - United States Department of Defense (Military Traffic Management Command)
 * DODZ - United States Department of Defense
 * DOEX - Doe Run Resources Corporation
 * DOLX - Dolese Brothers Company
 * DONX - Donnelly Commodities Company
 * DOTX - United States Department of 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 Gorge Railway
 * DRHY - Durham Transport
 * DRI - Davenport, Rock Island and North Western Railway
 * DRIR - Denver Rock Island Railroad
 * DRMX - Danbury Railway Museum
 * DRR - Delaware and Raritan River Railroad
 * DRR - Disneyland Railroad
 * DRRV - Dover and Rockaway River Railroad
 * DRSX - D.O.T. Rail Services, Inc.
 * DRTU - Dart Intermodal, Inc.
 * DRTZ - Dart Intermodal, Inc.
 * DSBU - Ameribrom, Inc.
 * DSCX - DIFCO, Inc.
 * DSDX - Pullman Leasing Company
 * DSEX - East Carbon Development Company
 * DSIX - Dowell Schlumberger, Inc.
 * DSLX - DeGussa Corporation
 * DSLZ - Intermodal Services, Inc.
 * DSRC - Dakota Southern Railway
 * DSRR - Delta Southern Railroad
 * DSRX - Downeast Scenic Railroad (and its parent organization, Downeast Rail Heritage Preservation Trust, Inc.)
 * DSSA - Duluth, South Shore and Atlantic Railway
 * DSSX - Detroit Salt Company, LLC
 * DT  - Decatur Junction Railway
 * DTCX - DTE Transportation Services, Inc.
 * DTEX - Dresser Transportation Equipment (Division of Dresser Industries)
 * DTI - Detroit, Toledo and Ironton Railroad; Grand Trunk Western Railroad; Canadian National Railway
 * DTIZ - Grand Trunk Western Railroad; Canadian National Railway
 * DTLX - Delta Tank Line Company
 * DTRR - Danbury Terminal Railroad; Housatonic Railroad
 * DTS - Detroit and Toledo Shore Line Railroad; Grand Trunk Western Railroad; Canadian National Railway
 * DTTX - TTX Corporation
 * DTZZ - Direct Transit, Inc.
 * DUCX - DuPont Canada, Inc.
 * DUFX - Duffy and Sons, Inc.
 * DUKX - Dupps Company
 * DUPX - DuPont
 * DUT - Denver Union Terminal Railway
 * DUTC - Dallas Union Terminal
 * DV  - Delaware Valley Railway
 * DVLX - Duval Corporation; Freeport-McRo-Ran Sulphur Company
 * DVR - Devco Railway; Cape Breton Development Corporation (Coal Division); Sydney Coal Railway (its successor)
 * DVRU - Dover, Ltd.
 * DVS - Delta Valley and Southern Railway
 * DVSZ - Delta Valley and Southern Railway
 * DVTX - SULCOM, Inc.
 * DW  - Detroit and Western
 * DWAU - Degussa Antwerpen, NV
 * DWC - Duluth, Winnipeg and Pacific Railway; Canadian National Railway
 * DWCX - David Witherspoon, Inc.
 * DWML - Due West Motor Line
 * DWP - Duluth, Winnipeg and Pacific Railway; Canadian National Railway
 * DYLX - Ronald L. Boothman Remainder Trust; Transportation Equipment
 * DYNX - Dyno Nobel, Inc.
 * DYRX - Dynamic Rail Preservation Inc.