| DA | Dominion Atlantic Ry. Co. | 7/23-10/66 |
| CP Rail (Dominion Atlantic Ry. Co.) | 1/75-1/80 | |
| CP Rail | Jan-94 | |
| CP Rail System | eliminated 1/97 | |
| Canadian Pacific Ry. Co. | added 1/97; 7/2000 | |
| DACX | Darling & Co. | 4/38-1/80 |
| VIP Tank Car Service | added 1/98; 7/2000; eliminated 7/2001 | |
| DAFX | Department of the Army, Office of the Chief of Transportation, Railway Transport Service Division | added 10/53 |
| Department of the Army, Office of the Chief of Transportation | Oct-57 | |
| Department of the Army | eliminated 7/58 | |
| Dept. of Defense, Military Traffic Management and Terminal Service | added 10/66; 10/66-4/70; eliminated 1/74 | |
| Dept. of Defense, Military Traffic Management Command | Jan-75 | |
| Dept. of Defense, Troop Support and Aviation Material Readiness Command (intra-plant service) | 1/80-1/94 | |
| Dept. of Defense | added 4/94; eliminated 7/94 | |
| Dept. of Defense, MTMC | eliminated 4/95 | |
| Dept. of Defense, Troop Support and Aviation Material Readiness Command (intra-plant service) | Jul-00 | |
| DAIR | D&I R.R. Co. | added 7/82; 1/94-7/2000 |
| DAIX | Mt. Vernon Car Manufacturing Co. | 1/52-4/61 |
| DAKR | Dakota Rail Inc. | added 7/82; eliminated 1/89; 1/94-7/2000; eliminated 10/2000 |
| DALX | Daly Refining Co. | Apr-38 |
| Dominion Alkali & Chemical Co., Ltd. | Jan-52 | |
| DANX | Danville Industries, Inc. | added 1/74; 1/75-1/80; eliminated 4/82 |
| DAPX | Dairyland Power Cooperative | 1/80-7/2000 |
| DATX | DATX Associates | 1/94-7/2000 |
| DAVX | W.R. Grace & Co.-Conn. Davison Chemical Division | added 10/89; 1/94; eliminated 7/97; 7/2000 |
| DAWX | D.A. Walmsley & Co. | Jul-00 |
| DAX | Diamond Alkali Co. | 4/38-10/66; eliminated 4/68 |
| Diamond Shamrock Corp. | added 4/68; 4/70-1/80 | |
| Diamond Shamrock Chemicals Co. | eliminated 7/87 | |
| Occidental Chemical Corp., Electrochemicals, Detergents & Specialty Products Group | added 7/87; eliminated 1/88 | |
| Occidental Chemical Corp., Electrochemicals, Detergents & Specialty Products | added 1/88; eliminated 10/89 | |
| Occidental Chemical Corp., Electrochemicals & Specialty Products | added 10/89; eliminated 1/92 | |
| Occidental Chemical Corp. | added 1/92; 1/94-7/2000 | |
| DBCX | Dow Badische Co. | added 1/73; 1/75; eliminated 7/79 |
| DBCX | Badische Corp. | added 7/79; 1/80; eliminated 4/86; 1/94 |
| BASF Corp. | added 4/86; 1/94-7/2000 | |
| DBGX | Dowdle Butane Gas Co., Inc. | added 1/68; 4/70-1/80; eliminated 4/86 |
| DBUX | The CIT Group/Capital Finance, Inc. | added 1/2001 |
| DBX | Douredoure Brothers | Apr-38 |
| DC | Delray Connecting R.R. Co. | 7/23-7/2000 |
| DCAX | Tarmac, Fla., Inc. | added 10/89; 1/94 |
| Tarmac, Fla., Inc., c/o Delray Connecting R.R. Co. | added 10/96 | |
| Tarmac, Fla., Inc. | eliminated 7/97; 7/2000 | |
| DCBX | Degussa Corp. | added 7/91; 1/94-7/2000 |
| DCCX | Davison Chemical Corp. | Jan-52 |
| Davison Chemical Co., Division of W.R. Grace & Co. | Oct-57 | |
| Des Plaines Chemical Co. | 7/65; added 10/66; 10/66; eliminated 1/69 | |
| McDonnell Douglas Corp. | added 10/70; 1/75-1/80; eliminated 4/89; added 4/90; 1/94-7/2000 | |
| DCFB | Dodge City Ford & Bucklin R.R. Co., Inc. | 1/94-7/2000 |
| DCFX | PLM Railcar Management Services Canada Ltd. | added 1/90; eliminated 4/91 |
| DCFX | PLM International, Inc. | added 4/91; 1/94-7/2000 |
| D&CI | Des Moines & Central Iowa R.R. | 23-Jul |
| DCI | Des Moines & Central Iowa Ry. Co. | 4/38-10/66 & 1/75-1/80 |
| DCIX | Danella Construction Corp. | added 7/88; 1/94; added 4/97; 7/2000 |
| DCLR | Delaware Coast Line R.R. Co. | added 10/83; 1/94; eliminated 1/95 |
| DCLX | Procor Ltd. | 1/80-1/94 |
| Dow Chemical Canada, Inc. | added 4/97; 7/2000 | |
| DCMX | Delta Chemical & Iron Co. | Apr-38 |
| Davidson Construction Materials, Inc. | added 4/82; eliminated 4/89 | |
| DCPX | Dacar Chemical Products Co. | 1/52-7/65; eliminated 7/66 |
| Dart Container Corp. of Pennsylvania | 1/75; added 4/75; 1/80-1/94; eliminated 4/2000; 7/2000 | |
| DCRR | Dubois County R.R. | 1/94-7/2000 |
| DCTX | PLM Railcar Management Services Canada Ltd. | added 1/87; eliminated 4/91 |
| PLM International, Inc. | added 4/91; 1/94-7/2000 | |
| DCWX | Detroit Chemical Works | 1/52-4/61 |
| W.R. Grace & Co., Davison Chemical Division, Detroit Chemical Works | 7/65-10/66; eliminated 10/69 | |
| Detroit Chemical Works, Division of Pressure Vessel Service, Inc. | added 10/69; 4/70; eliminated 1/75 | |
| DCX | Diamond Alkali Co. of California | 1/52; eliminated 7/56 |
| DDDX | Frontier Cooperative Co. | added 4/91; eliminated 10/92; 1/94-7/2000 |
| DDEX | Dupont Dow Elastomere, L.L.C. | Jul-00 |
| DDNX | Didion, Inc. | added 7/93; 1/94; eliminated 1/2000; added 7/2000 |
| DECX | Duval Engineering & Contracting Co. | 1/52-10/57 |
| DEEX | The Detroit Edison Co. | added 10/68; 4/70-7/2000 |
| DEGX | Mississippi Power Co. | added 7/78; 1/80-7/2000 |
| DEMX | Demeter, Inc. | added 4/89; 1/94-7/2000 |
| DEPX | Dependable Properties, Inc. | added 10/74; 1/75-1/80 |
| DER | Dunn-Erwin Ry. Corp. | Jan-94 |
| DETX | The Detroit Edison Co. | added 4/96; 7/2000 |
| DFFX | Durkee Famous Foods, Division of the Glidden Co. | 4/38-4/61 |
| Glidden Co. | 7/65-4/70; eliminated 10/71 | |
| DFIX | Weyerhauser Co., Dierks Division | added 4/72; added 7/73 |
| DFTX | DTE Transportation Services, Inc. | Jul-00 |
| DTE Coal Services, Inc. | added 7/2001 | |
| DGBY | Digby Trucklines | Jul-00 |
| DGCX | Dakota Gasification Co. | added 10/96; 7/2000 |
| DGHX | North American Chemical | added 7/92; 1/94-7/2000 |
| DGNO | Dallas, Garland & Northeastern R.R., Inc. | 1/94; added 7/94; 7/2000 |
| D&H | Delaware and Hudson R.R. Corp. | 1/52-10/66 |
| DH | Delaware and Hudson Ry. Co., Inc. | 1/75-1/80; eliminated 7/91 |
| D & H Corp. | added 7/91; eliminated 7/92 | |
| Delaware and Hudson Ry. Co., Inc. | added 7/92; 1/94-7/2000 | |
| DHDO | New York, Susquehanna and Western Ry. Corp. | eliminated 7/91 |
| DHNY | Delaware and Hudson Ry. Co., Inc. | added 10/81; eliminated 10/88; added 7/89; eliminated 7/91 |
| D & H Corp. | added 7/91; eliminated 7/92 | |
| Delaware and Hudson Ry. Co., Inc. | added 7/92; 1/94-7/2000 | |
| DHPX | Degussa Corp. | added 4/98; 7/2000 |
| DICX | Dry Ice Co., Refrigerator Line | Apr-38 |
| Merchants Despatch Transportation Corp. | 1/52-7/65 | |
| "Dry Ice" Refrigerator Line, Pure Carbonic Co., a Division of Air Reduction Co., Inc. (Merchants Despatch Transportation Corp.) | Oct-66 | |
| Merchants Despatch Transportation Corp. | Apr-70 | |
| Airco Industrial Gases, Division Air Reduction Co., Inc. | eliminated 1/72 | |
| Airco Industrial Gases, a Division of Airco, Inc. | added 1/72; eliminated 4/73 | |
| Merchants Despatch Transportation Corp. | 1/75-1/80; eliminated 1/80 | |
| D&IM | Denver & Intermountain R.R. Co. | 7/23-1/52 |
| DIM | Denver & Intermountain R.R. | 4/38-1/52 |
| D&IR | The Duluth & Iron Range R.R. Co. | 23-Jul |
| Duluth & Iron Range R.R. | 4/38-1/52 | |
| DJBX | Donald J. Bertel d/b/a Gandy Dancer, Inc. | Jul-00 |
| DJJX | The David J. Joseph Co. | added 10/89; 1/94; eliminated 4/2000 |
| Joseph Transportation Inc. | added 4/2000; 7/2000 | |
| DJLX | The David J. Joseph Co. | added 10/96; eliminated 7/98 |
| DJJ Leasing Ltd. | added 7/98; eliminated 4/2000 | |
| Joseph Leasing Ltd. | added 4/2000; 7/2000 | |
| DJMX | Daniel John Marnell | Jul-00 |
| DJPX | The David J. Joseph Co. | added 7/97; eliminated 4/2000 |
| Joseph Transportation Inc. | added 4/2000; 7/2000 | |
| DJRX | The David J. Joseph Co. | added 7/96; eliminated 4/2000 |
| Joseph Transportation Inc. | added 4/2000; 7/2000 | |
| DJTX | The David J. Joseph Co. | added 7/94; eliminated 4/2000 |
| Joseph Transportation Inc. | added 4/2000; 7/2000 | |
| DKPX | Duke Power Co. (scale test cars) | 1/94-7/2000 |
| DKS | Doniphan, Kensett & Searcy Ry. | 1/75; added 1/77; 1/80-1/94 |
| Missouri Pacific System | eliminated 4/97 | |
| Union Pacific R.R. Co. | added 4/97; 7/2000 | |
| DKUX | Exxon Co., U.S.A. | 1/94; eliminated 7/2000 |
| Exxon Mobil Corp. | added 7/2000; 7/2000 | |
| DK&W | DeKalb & Western R.R. Co. | 23-Jul |
| DKW | DeKalb & Western R.R. | 4/38-1/52 |
| DL | Delaware-Lackawanna R.R. Co., Inc. | added 1/94; 7/2000 |
| DLC | Drummond Lighterage | 1/75-7/2000 |
| DLCX | David Levi & Co. (Mather Stock Car Co.) | Apr-38 |
| Dearborn Leasing Co. | added 7/64; 7/65-1/80; eliminated 7/82 | |
| DLDX | Dow Chemical Co., Ludington Division | 10/57-7/65; eliminated 1/66 |
| DLFX | Diversified Lease Funding, Inc. | 1/94; added 4/94; eliminated 7/98; 7/2000 |
| DLGX | Lewis Grain Co. | added 7/77; 1/80; eliminated 4/89 |
| DLMX | Daylight Locomotives & Machine Works, Inc. | 1/94-7/2000 |
| DLOX | Dominion Linseed Oil Co., Ltd. | 4/38-1/52 |
| DLPX | Degussa Canada Ltd. | Jul-00 |
| DLRX | North American Car Corp. | added 7/56; 10/57-1/80 |
| General Electric Railcar Services Corp. | 1/94; eliminated 1/2000 | |
| General Electric Rail Services Corp. | added 1/2000; 7/2000 | |
| DLSX | Diesel Supply Co. Inc. | Jul-00 |
| DLTX | Dale L. Thornborough | 1/80; added 7/80; eliminated 10/90; 1/94-7/2000 |
| DLVX | Thiokol Corp. | added 4/97; 7/2000 |
| DL&W | The Delaware, Lackawanna & Western R.R. Co. | 23-Jul |
| Delaware, Lackawanna & Western R.R. | 4/38-7/65 | |
| Erie Lackawanna R.R. Co. (Delaware, Lackawanna & Western R.R. Co.) | Oct-66 | |
| Erie Lackawanna Ry. Co., Thomas J. Patton and Ralph S. Tyler, Jr., Trustees | eliminated 4/76 | |
| Consolidated Rail Corp. | added 4/76 | |
| DLW | Erie Lackawanna R.R. Co. (Delaware, Lackawanna & Western R.R. Co.) | Jan-75 |
| Consolidated Rail Corp. | 1/80; 1/94; eliminated 7/99 | |
| DLWR | Depew, Lancaster & Western R.R. Co., Inc. | 1/94-7/2000 |
| DLWX | D.L. & W., Inc. | Jul-00 |
| DLX | Dyson's Ltd. | 1/52-4/61; eliminated 4/62 |
| Catelli Food Products, Ltd. | added 4/62; eliminated 7/64 | |
| D&M | Detroit & Mackinac Ry. | 7/23-4/61 |
| DM | (D&M) Detroit & Mackinac Ry. | 7/65-10/66 |
| Detroit & Mackinac Ry. | 1/75-1/80; eliminated 4/92 | |
| Lake State Ry. Co. | added 4/92; 1/94-7/2000 | |
| DMCX | Des Moines Ice Co. | added 7/63 |
| DME | Dakota, Minnesota & Eastern R.R. Corp. | added 1/87; 1/94-7/2000 |
| DMHX | Davenport Mammoet L.L.C. | added 4/97; 7/2000 |
| DMIR | Duluth, Missabe & Iron Range Ry. Co. | 4/38-7/2000 |
| DMIX | Minnesota Corn Processors, Inc. | added 4/95; eliminated 7/95 |
| Minnesota Corn Processors Bulk Products Division | added 10/95; 7/2000 | |
| DMLX | General Electric Rail Services Corp. | added 4/2000; 7/2000 |
| D&MM | The Dansville & Mount Morris R.R. Co. | 23-Jul |
| Dansville & Mount Morris R.R. Co. | Apr-38 | |
| DMM | Dansville & Mount Morris R.R. Co. | 1/75-7/2000 |
| DM&N | Duluth, Missabe & Northern Ry. | 4/38-1/52 |
| DMRX | Decker Meat Refrigerator Line (General American Transportation Corp.) | Apr-38 |
| DMU | Des Moines Union Ry. Co. | 7/23-10/66 & 1/75-1/80; eliminated 10/89 |
| DMVW | Dakota, Missouri Valley & Western R.R., Inc. | added 1/91; 1/94-7/2000 |
| D&N | Delaware & Northern R.R. Co. | 23-Jul |
| Delaware & Northern R.R. | Apr-38 | |
| DNAX | Dana Railcare | added 1/96; 7/2000 |
| DNCX | Denco Petroleum, Inc. | added 10/91; eliminated 1/93; 1/94 |
| DNE | Duluth & Northeastern R.R. Co. | 1/75-1/80; eliminated 1/85; eliminated 1/94; 7/2000 |
| DOCX | DuPont of Canada Ltd. | added 10/65; 10/66-1/75; eliminated 1/80 |
| Du Pont Canada Inc. | added 1/80; 1/80-7/2000 | |
| DODX | Dept. of Defense, Military Traffic Management and Terminal Service | added 10/65; 10/66-4/70 |
| Dept. of Defense, Military Traffic Management Command | 1/75-7/2000 | |
| DOLX | Dolese Bros. Co. | added 7/78; 1/80-7/2000; eliminated 7/2000 |
| DOMX | Dothan Oil Mill Co. | 1/52-10/57; eliminated 7/58 |
| DORX | Dallas Oil & Refining Co. | Apr-38 |
| DOTX | USDOT/Federal Railroad Administration | Jul-00 |
| DOWX | The Dow Chemical Co. | 4/38-7/2000 |
| DOX | Derby Oil Co. (General American Transportation Corp.) | Apr-38 |
| Derby Oil Co. | 1/52; eliminated 4/55 | |
| Derby Refining Co. | added 4/55; 10/57; eliminated 1/60 | |
| DP | Deer Park Ry. | 4/38-1/52 |
| DPCX | Dewey Portland Cement Co. | 1/52-10/57; eliminated 7/60 |
| Dewwy Portland Cement Co., Division of American-Marietta Co. | added 7/60; 4/61 | |
| Dewey Portland Cement Co., Division of Martin-Marletta Corp. | 7/65-4/70; eliminated 10/72 | |
| Martin-Marietta Cement, Division of Martin-Marietta Corp. | added 10/72; 1/75; eliminated 1/79 | |
| Martin-Marietta Corp. | added 1/79; 1/80 | |
| Blue Circle, Inc. | eliminated 10/88 | |
| DPIX | Distillation Products Industries, Division of Eastman Kodak Co. | Jan-52 |
| Dufour Petroleum, Inc. | 1/94; added 1/97; 7/2000 | |
| DPLX | Dewey Portland Cement Co., Division of Martin-Marletta Corp. | added 1/65; 7/65-4/70; eliminated 10/72 |
| Martin-Marietta Cement, Division of Martin-Marietta Corp. | added 10/72; 1/75; eliminated 1/79 | |
| Martin-Marietta Corp. | added 1/79; 1/80 | |
| Davenport Cement Co. | eliminated 4/85 | |
| DPRX | Deep Rock Refining Co. | 10/57-10/66; eliminated 7/68 |
| DPTX | D.P. Tafe | Jan-52 |
| DPWX | Dixon Plywood, a Division of Dixon Lumber Co., Inc. | added 7/74; 1/75-1/80; eliminated 1/81 |
| DPX | Reconstruction Finance Corp. | Jan-52 |
| DQE | De Queen and Eastern R.R. Co. | 1/75-7/2000 |
| DR | Dardanelle & Russellville R.R. Co. | 1/75-1/80; added 7/81; eliminated 7/88; 1/94-7/2000 |
| DRAX | Drake Tank Car Co. | added 1/66; 10/66-4/70; eliminated 11/73 |
| DRAYCUTT Corp. | added 7/82; eliminated 1/90 | |
| DRCX | Dragon Cement Co., Division of Martin Marietta Corp. | added 7/69; 4/70; eliminated 10/72 |
| Martin-Marietta Cement, Division of Martin-Marietta Corp. | added 10/72; 1/75; eliminated 1/79 | |
| Martin Marietta Corp. | added 1/79; 1/80; eliminated 7/86 | |
| DRDX | Detroit Reduction Co. | Apr-38 |
| Duredo Co. (John H. Grace Co.) | 1/52-1/75; eliminated 7/79 | |
| The Duredo Co. | added 7/79; 1/80; eliminated 4/86 | |
| D&RG | Denver & Rio Grande Western R.R. System | 23-Jul |
| D&RGW | Denver & Rio Grande Western R.R. | 4/38-10/66 |
| DRGW | (D&RGW) Denver & Rio Grande Western R.R. Co. | Apr-70 |
| Denver & Rio Grande Western R.R. Co. | 1/75-1/94; eliminated 7/97 | |
| Union Pacific R.R. Co. | added 7/97; 7/2000 | |
| DRGX | Denver & Royal Gorge Ry., LLC | Jul-00 |
| DRHY | Durham Transport Inc. | Jan-94 |
| Durham Transport | added 7/2000; 7/2000 | |
| DRI | Davenport, Rock Island & North Western Ry. Co. | 7/23-1/94; eliminated 7/96; 7/2000 |
| DRIR | Denver Rock Island R.R. | added 4/97; 7/2000 |
| DRLX | Delaware Railcar Leasing, Inc. | added 4/68; 4/70-1/75; eliminated 7/79 |
| DRMX | Danbury Railway Museum Inc. | Jul-00 |
| DRSX | D.O.T. Rail Services, Inc. | Jul-00 |
| DR&U | Delaware River & Union R.R. Co. | 23-Jul |
| Delaware River & Union R.R. | Apr-38 | |
| DRWY | Denver Ry., Inc. | added 1/90; eliminated 10/92; 1/94 |
| DRX | Deep Rock Oil Corp. | Apr-38 |
| DRYX | Merchants Despatch Transportation Corp. | added 10/60; 4/61 |
| DS | Durham and Southern Ry. Co. | 1/75-1/80; eliminated 4/82 |
| DS&A | Duluth, South Shore & Atlantic Ry. | 23-Jul |
| DSA | Duluth, South Shore & Atlantic R.R. | 1/52-4/61 |
| Soo Line R.R. | Jul-65 | |
| Duluth, South Shore and Atlantic R.R. Co. | Oct-66 | |
| Soo Line R.R. | eliminated 11/73; 1/75 & 1/94-7/2000 | |
| DSCX | DIFCO, Inc. | 1/94-7/2000 |
| DSDX | Dairy Shippers Despatch Co. | 4/38-10/66; eliminated 1/67 |
| Transport Leasing, a Division of Pullman Inc. | added 1/67; 4/70; eliminated 10/70 | |
| Pullman Transport Leasing Co., a Subsidiary of Pullman Inc. | added 10/70; 1/75-1/80; eliminated 4/81 | |
| Pullman Leasing Co. | added 4/81; eliminated 1/90 | |
| Itel Rail Corp. | added 1/90; eliminated 10/92 | |
| General Electric Railcar Services Corp. | added 10/92; 1/94 | |
| DSIX | Dowell Schlumberger Inc. | added 1/95; 7/2000 |
| D&SL | Denver & Salt Lake Ry. Co. | 23-Jul |
| Denver & Salt Lake Ry. | 4/38-10/57 | |
| Denver & Rio Grande Western R.R. | 4/61-7/65 | |
| DSLX | Dominion Sugar Co. (Canada and Dominion Sugar Co., Ltd.) | 4/38-1/52 |
| Canada and Dominion Sugar Co. | 10/57-4/61 | |
| DeGussa Corp. | added 4/97; 7/2000 | |
| DSO | Donora Southern R.R. Co. | 23-Jul |
| Donora Southern R.R. | 4/38-4/61 | |
| DSRC | Dakota Southern Ry. Co. | added 4/86; 1/94-7/2000 |
| DSRR | Delta Southern R.R. Co. | 1/94-7/2000 |
| DSS&A | Duluth, South Shore & Atlantic Ry. | Apr-38 |
| DSSX | The Detroit Salt Co., L.C. | Jul-00 |
| DSW | Deering Southwestern Ry. | 23-Jul |
| DT | Detroit Terminal R.R. Co. | 7/23-10/66 & 1/75-1/80; eliminated 1/82 |
| Decatur Junction Ry. Co. | 1/94-7/2000 | |
| DTCX | Dominion Tar & Chemical Co., Ltd. | 4/38-7/65; eliminated 10/65 |
| Domtar Ltd. | added 10/65; 10/66-4/70; eliminated 7/73 | |
| DTE Transportation Services, Inc. | Jul-00 | |
| DTE Coal Services, Inc. | added 7/2001 | |
| DTDX | Dow Chemical Co., Texas Division | 1/52-10/57; eliminated 7/58 |
| General American Transportation Corp. | added 7/58; eliminated 10/58 | |
| Dow Chemical Co., Texas Division | 4/61-7/65; eliminated 1/66 | |
| DTEX | Dresser Transportation Equipment Division, Dresser Industries, Inc. | added 10/69; 4/70-1/80; eliminated 1/81 |
| Dresser Transportation Equipment Division, Dresser Industries, Inc. (test cars) | 1/94-7/2000 | |
| DT&I | Detroit, Toledo & Ironton R.R. Co. | 23-Jul |
| Detroit, Toledo & Ironton R.R. | 4/38-10/66 | |
| DTI | Detroit, Toledo & Ironton R.R. Co. | 4/61-10/66 & 1/75-1/80 |
| Grand Trunk Western R.R. Inc. | 1/94-7/2000 | |
| DTLX | Delta Tank Line Co. | added 7/63; 7/65-1/80; eliminated 7/92; 1/94-7/2000 |
| DTMR | Denver Terminal R.R. Co. | added 10/87; eliminated 4/90 |
| DTRR | Danbury Terminal R.R. Co. | added 4/93; 1/94; eliminated 7/97 |
| Housatonic R.R. Co., Inc. | added 7/97; eliminated 10/97 | |
| Danbury Terminal R.R. Co. | Jul-00 | |
| D&TS | Detroit & Toledo Shore Line R.R. Co. | 23-Jul |
| Detroit & Toledo Shore Line R.R. | 4/38-4/61 | |
| DTS | (D&TS) Detroit & Toledo Shore Line R.R. Co. | 7/65-10/66 |
| Detroit & Toledo Shore Line R.R. Co. | 1/75-1/80; eliminated 1/82 | |
| Grand Trunk Western R.R. Inc. | added 1/82; 1/94-7/2000 | |
| DTTX | Trailer Train Co. | added 1/85; eliminated 1/92 |
| TTX Co. | added 1/92 | |
| TTX Co. (well-type COFC cars, capable of carrying double-stacked containers) | Jan-94 | |
| TTX Co. (well-type cars, capable of carrying double-stacked containers, and in some cases trailers) | Jul-00 | |
| DUCX | Du Pont Canada Inc. | 1/94-7/2000 |
| DUFX | Merchants Despatch Transportation Corp. | 1/52; eliminated 4/54 |
| DUKX | Duke, Inc. | added 4/67; 4/70 |
| The Dupps Co. | 1/75-7/2000 | |
| DUPX | E.I. du Pont de Nemours & Co., Inc. | 4/38-7/2000 |
| DUT | Denver Union Terminal Ry., Co. | 1/94-7/2000 |
| DUTC | Dallas Union Terminal | 1/75-7/2000 |
| DUX | Donner-Hanna Coke Corp. | 4/38-1/75; eliminated 1/80 |
| Donner-Hanna Coke Joint Venture | added 1/80; 1/80 | |
| Donner-Hanna Coke Corp. | eliminated 10/82 | |
| DV | Delaware Valley Ry. Co., Inc. | added 10/94; eliminated 10/99; 7/2000 |
| DVLX | Duval Sales Corp. | Jan-75 |
| Duval Corp. | added 7/78; 1/80; eliminated 4/85 | |
| Pennzoil Sulphur Co. | added 4/85; eliminated 4/92 | |
| Pennzoil Co. | added 4/92; 1/94; eliminated 4/96 | |
| Freeport Sulphur Co. | added 7/96 | |
| Freeport Sulphur Co., a Division of Freeport-McMoRan Resource Partners, Ltd. | eliminated 4/98 | |
| Freeport-McMoRan Sulphur Inc. | added 4/98; eliminated 1/99 | |
| Freeport-McMoRan Sulphur LLC | added 1/99; 7/2000 | |
| DVR | Devco Ry., Cape Breton Development Corp. (Coal Division) | 1/75-1/94; eliminated 4/2000; 7/2000 |
| DVS | Delta Valley & Southern Ry. Co. | 1/75; added 7/79; 1/80-7/2000 |
| D&W | Danville & Western Ry. (Southern Ry. System) | 23-Jul |
| Danville & Western Ry. | Apr-38 | |
| DW | Detroit & Western | 1/75-1/80 |
| DWC | Duluth, Winnipeg & Pacific Ry. | 1/75-1/80; eliminated 1/93 |
| Canadian National Rys. | added 1/93; 1/94-7/2000 | |
| DWCX | David Witherspoon, Inc. | 7/65-1/80; eliminated 10/93; 1/94-7/2000 |
| DWML | Due West Motor Line | 1/75-1/80 |
| DW&P | Duluth, Winnipeg & Pacific Ry. | 23-Jul |
| DWP | Duluth, Winnipeg & Pacific Ry. | 4/38-10/66 & 1/75-1/80; eliminated 10/81; added 4/89; eliminated 1/93 |
| Canadian National Rys. | added 1/93; eliminated 7/93 | |
| Duluth, Winnipeg & Pacific Ry. | added 7/93; 1/94-7/2000 | |
| DYLX | Koppers Co., Inc. | added 7/59 |
| Manufacturers Leasing Corp. | Apr-61 | |
| Koppers Co., Inc. | eliminated 1/62 | |
| Manufacturers Leasing Corp. | added 1/62; 7/65-1/80; eliminated 4/84 | |
| Ronald L. Boothman Remainder Trust | added 4/84; eliminated 4/85 | |
| Transportation Equipment, Inc. | added 4/85; 1/94-7/2000 | |
| DYNX | Dynabulk Corp. | added 4/66; 10/66; eliminated 7/69 |
| Dyno Nobel, Inc. | added 1/94; 7/2000 |