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. DIR - Duluth and Iron Range Railway 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 - Diesel Locomotive Company 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 DMN - Duluth, Missabe and Northern Railway 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.