| TACX | Transport Arts Corp. | added 4/72; 1/75-1/80; eliminated 4/88 |
| The American Coal Sales Co. | Jul-00 | |
| TADX | T.A.D. Jones & Co., Inc. | 4/38-1/52 |
| TAEA | Tangipahoa & Eastern | 1/75-1/80 |
| TAEX | The Andersons | added 10/2000 |
| TA&G | Tennessee, Alabama & Georgia Ry. Co. | 4/38-4/70 |
| TAG | Tennessee, Alabama & Georgia Ry. Co. | 1/75-1/80 |
| Southern Ry. System | eliminated 1/83; eliminated 1/91 | |
| Norfolk Southern Ry. Co. | added 1/91; 1/94-7/2000 | |
| TAGX | Texoma AG Products Inc. | Jul-00 |
| TAIX | Texas Alkyls, Inc. | added 4/90; eliminated 4/91; 1/94-7/2000 |
| TALX | Trical, Inc. | 1/94-7/2000 |
| TANX | Transitank Car Corp. | added 7/73; 1/75; eliminated 7/79 |
| Transitank Car Leasing Corp. | added 7/79; 1/80 | |
| Transitank Car Corp. | eliminated 10/93 | |
| TransiTech, Inc. | added 10/93; 1/94-7/2000; eliminated 10/2000 | |
| TAP | T and P Ry., Inc. | added 1/92; eliminated 7/93; 1/94 |
| TARX | Sandersville Leasing Co. | added 10/81 |
| Sandersville Leasing, Inc. | 1/94-7/2000 | |
| TAS | Tampa Southern R.R. Co. | 1/75-1/80 |
| TASD | Terminal Ry. Alabama State Docks | 1/75; added 7/77; 1/80-7/2000 |
| TASX | Tasco, Inc. | added 4/62; 7/65; eliminated 10/65 |
| Transammonia, Inc. | added 4/92; eliminated 7/94 | |
| Transrail, Inc. | 1/94; added 7/94; 7/2000 | |
| TATX | Tanco Transportation Corp. | added 7/79; 1/80; eliminated 4/89 |
| General Electric Railcar Services Corp. | 1/94; eliminated 1/2000 | |
| General Electric Rail Services Corp. | added 1/2000; 7/2000 | |
| TA&W | Toledo, Angola & Western Ry. Co. | 4/38-4/70 |
| TAW | Toledo, Angola & Western Ry. Co. | 1/75-1/80; eliminated 1/80 |
| TAX | Trumbull Asphalt Co. | Apr-38 |
| TAZX | Trade Wind Ltd. | added 7/99; 7/2000 |
| TB | Twin Branch R.R. Co. | 1/75; eliminated 7/78 |
| TBAX | Toronto Pipe Line Co. | 1/52-10/57 |
| Canadian General Transit Co., Ltd. | 4/61; eliminated 4/61 | |
| TBCX | The Boeing Co. | added 1/68; 4/70-7/2000 |
| TBER | Terre Haute, Brazil & Eastern R.R. | added 4/88; eliminated 1/94; 7/2000 |
| TBRX | The Taylor Rail Group, Inc. | Jul-00 |
| TBRY | Thermal Belt Ry. | 1/94-7/2000 |
| TC | Tennessee Central Ry. Co. | 4/38-10/66 |
| TCB | Texas Central Business Lines Corp. | added 4/2001 |
| TCAX | Transportation Corp. of America | added 4/74; 1/75-1/80; eliminated 4/91 |
| Transportation Corp. of America | added 4/91; eliminated 1/94 | |
| General Electric Railcar Services Corp. | added 1/94; eliminated 1/2000 | |
| General Electric Rail Services Corp. | added 1/2000; 7/2000 | |
| TCCX | Taylor Chemical Corp. | Apr-38 |
| Thompson Chemical Co. | 7/65; eliminated 4/66 | |
| Thompson Apex Co., Division of Continental Oil Co. | added 4/66; 10/66; eliminated 7/68 | |
| Trumix Concrete Co. | added 10/78; 1/80; eliminated 4/80 | |
| TCCX Corp. | added 4/80; eliminated 1/91; 1/94-7/2000 | |
| TCDX | Tank Car Despatchers Service, Inc. | 10/57; eliminated 1/58 |
| Tennessee Chemical Co. | added 1/83; eliminated 10/84 | |
| Union Tank Car Co. | added 10/84; 1/94-7/2000 | |
| TC&G | Tucson, Cornelia and Gila Bend R.R. Co. | Apr-38 |
| TCG | Tucson, Cornelia and Gila Bend R.R. Co. | 1/52-1/94; eliminated 10/97; 7/2000 |
| TCGX | Tri-County Gas, Inc. | added 10/83; 1/94; eliminated 7/96; added 10/96; eliminated 4/97 |
| Williams Energy Ventures, Inc. | added 10/99; 7/2000 | |
| TCIX | Tennessee Coal, Iron and Railroad Co. | 4/38-1/52 |
| Trinity Chemical Leasing, L.L.C. | added 4/2000; 7/2000; eliminated 10/2000 | |
| TCKR | Turtle Creek Industrial R.R., Inc. | added 1/83; 1/94-7/2000 |
| TCLX | Transit Co., Ltd. | 4/38-1/52; eliminated 10/53 |
| Union Tank Car Co. | added 10/53; 10/57 | |
| Trinity Chemical Leasing, L.L.C. | added 4/2000; 7/2000; eliminated 10/2000 | |
| TCMX | Transportation Corp. of America | added 4/89; eliminated 4/91 |
| Transportation Corp. of America | added 7/92; 1/94; eliminated 1/98 | |
| The CIT Group/Capital Finance, Inc. | added 1/98; 7/2000 | |
| TCOX | Trinity Cotton Oil Co. | Apr-38 |
| Trinity Cotton Oil Division of The Best Foods, Inc. | 1/52; eliminated 1/53 | |
| The Concrete Co. | Jul-00 | |
| TCPX | Taylor-Colquitt Co. | 1/52-10/57 |
| Transport Capital | added 10/2000; eliminated 4/2001 | |
| Transport Capital Rail Partners, L.L.C. | added 4/2001 | |
| TCQX | Thrall Car Manufacturing Co. | added 4/2000; 7/2000 |
| TCSX | Transcontinental Systems, Inc. | Apr-70 |
| Tank Car Services, Inc. | added 1/80; 1/80; eliminated 1/86 | |
| TCT | Texas City Terminal Ry. Co. | 4/38-7/2000 |
| TCTX | Tube City, Inc. | Jul-00 |
| TCWR | Twin Cities & Western R.R. | added 4/92; 1/94-7/2000 |
| TCWX | Charles Lennig & Co., Inc. | Apr-38 |
| TCX | The Texas Co. (Pennsylvania-Conley Tank Line, a Division of General American Transportation Corp.) | Apr-38 |
| General American Transportation Corp. | 1/52-7/65 | |
| Texaco, Inc. (General American Transportation Corp.) | Oct-66 | |
| General American Transportation Corp. | 4/70-1/94; eliminated 1/98 | |
| General American Marks Co. | added 1/98; 7/2000 | |
| TE | Tacoma Eastern Ry. Co. | added 4/95; eliminated 7/97; 7/2000 |
| TEAX | Teal Tank Car Co. | added 7/67; 4/70; eliminated 7/73 |
| Transportation Equipment, Inc. | added 7/93; 1/94-7/2000 | |
| TECX | TEC Terminals, Inc. | added 7/70 |
| Robertson Terminals, Inc. | 1/75; eliminated 1/77 | |
| Paktank Gulfcoast, Inc. | added 1/77 | |
| Texas Crushed Stone Co. | added 10/82; eliminated 5/83; 1/94 | |
| TEGX | Transenergy Grinding Inc. | added 4/97; 7/2000 |
| TEIX | Transportation Equipment, Inc. | added 4/84; 1/94-7/2000 |
| TELX | Tacoma Electrochemical Co. (Pennsylvania Salt Mfg. Co. of Washington) | 4/38-1/52 |
| Pennsylvania Salt Manufacturing Co. of Washington | eliminated 10/57 | |
| Pennsalt of Washington Division, Pennsalt Chemicals Corp. | added 10/57; 10/57; eliminated 10/60 | |
| Pennsalt Chemicals Corp. | added 10/60; 4/61-10/66; eliminated 1/69 | |
| Pennsalt Carriers Corp. | added 1/69; 4/70; eliminated 1/75 | |
| Pennwalt Carriers Corp. | added 1/75; 1/75-1/80; eliminated 1/93 | |
| ELF Atochem North America, Inc. | added 1/93; 1/94-7/2000 | |
| TEM | Temiskaming & Northern Ontario Ry. | Apr-38 |
| Ontario Northland Ry. | 1/52-4/70 | |
| Temiskaming & Northern Ontario Ry. | 1/75-1/80 | |
| TEMX | Temple-Eastex Inc. | added 10/78; 1/80; eliminated 7/89 |
| Temple-Inland Forest Products Corp. | added 7/89; 1/94-7/2000 | |
| TENN | Tennessee Ry. Co. | 1/75-7/2000 |
| TENX | Tennessee Corp. | Jan-52 |
| TETX | Transelectrix Technology Inc. | added 10/87; eliminated 7/90 |
| Asea Brown Boveri, Inc. | added 7/90; eliminated 7/92 | |
| TEXC | Texas Central R.R. Co. | 4/70-1/80; eliminated 7/92; 1/94-7/2000 |
| TFM | TFM, S.A. de C.V. | added 10/97; 7/2000 |
| TFVM | Terminal Ferroviaria Del Valle De Mexico, S.A. de C.V. | Jul-00 |
| T&G | Tremont & Gulf Ry. | 4/38-4/70 |
| TGAX | Texasgulf Inc., Agricultural Chemicals Operation | added 1/78; 1/80; eliminated 10/80 |
| Texasgulf Inc. | added 10/80; 1/94; eliminated 10/95 | |
| PCS Phosphate Co., Inc. | added 10/95; 7/2000 | |
| TGBX | T.G. Bright & Co., Ltd. | Apr-38 |
| TGCX | Tank Gas Corp. | 1/52-4/61; eliminated 7/63 |
| Thru-Haul, Inc. | added 7/63; eliminated 1/65 | |
| Hopane Distributing Co. | added 1/65; 7/65-10/66; eliminated 10/68 | |
| Protane Corp., Division of Northern Gas Co. | added 10/68 | |
| Protane Corp., Division of Northern Propane Gas Co. | 4/70; eliminated 10/74; 1/75-1/80 | |
| The GEON Co. | added 7/99; 7/2000; eliminated 1/2001 | |
| The PolyOne Co. | added 1/2001 | |
| TGIX | Texas Gulf, Inc. | added 10/72 |
| Texasgulf Inc. | 1/75; eliminated 1/78 | |
| Texasgulf Inc., Sulphur Operation | added 1/78; 1/80; eliminated 10/80 | |
| Texasgulf Inc. | 1/94; eliminated 10/95 | |
| PCS Phosphate Co., Inc. | added 10/95; 7/2000 | |
| TGOX | Transgo | added 4/65; eliminated 7/65 |
| Transgo, Inc. | added 7/65; 7/65-10/66; eliminated 4/69 | |
| Railease Corp. | added 4/69; eliminated 1/70 | |
| Rail-U.S. Leasing, Inc. | added 1/70; 4/70-1/75; eliminated 4/78 | |
| U.S. Rail Services, Inc. | added 4/78; 1/80-1/94; eliminated 4/94 | |
| USL Capital Rail Services | added 4/94; eliminated 10/96 | |
| First Union Rail | added 10/96; 7/2000 | |
| TGPX | Tamak Gas Products Co., Inc. | added 4/62 |
| Tamak Transportation Corp. | 7/65-7/2000 | |
| TGRX | Transglobal Rail, Inc. | Jul-00 |
| TGSX | Texas Gulf Sulphur Co. | 7/65-4/70 |
| Texasgulf Inc. | 1/75; eliminated 1/78 | |
| Texasgulf Inc., Soda Ash Operation | added 1/78; 1/80-1/94; eliminated 10/95 | |
| TG Soda Ash, Inc. | added 10/95; eliminated 4/2000 | |
| FMC Corp. | added 4/2000; 7/2000 | |
| TGX | Texas Gulf Sulphur Co. | Apr-38 |
| THB | Toronto, Hamilton & Buffalo Ry. Co. | 4/38-1/80; eliminated 10/87 |
| CP Rail | Jan-94 | |
| CP Rail System | eliminated 1/97 | |
| Canadian Pacific Ry. Co. | added 1/97; 7/2000 | |
| THCX | Publiker Industries, Inc. | added 1/86; 1/94; eliminated 10/94 |
| MG Industries | Jul-00 | |
| THKX | Thompson-Hayward Chemical Co. | 4/38-10/66; eliminated 4/70 |
| THRX | Transportation Corp. of America | added 7/99; 7/2000 |
| THX | The Harbauer Co. | Apr-38 |
| TIBR | TimberRock R.R. Co., Inc. | Jul-00 |
| TICX | Fruit Growers Express | Jul-65 |
| Thermice Corp., Philadelphia, PA (National Car Co.) | Oct-66 | |
| Fruit Growers Express Co. | Apr-70 | |
| National Car Co. | eliminated 1/72 | |
| Fruit Growers Express Co. | added 1/72; 1/75; eliminated 1/75 | |
| TIDX | Tidewater Oil Co. | 4/38-10/66; eliminated 10/67 |
| Getty Oil Co. | added 10/67; 4/70; eliminated 4/72 | |
| TIIX | Transportex International, Inc. | added 10/74; 1/75; eliminated 4/79 |
| TILX | Trinity Industries Leasing Co. | added 7/79; 1/80-7/2000 |
| TIMX | Trinity Industries Leasing Co. | added 1/81; 1/94-7/2000 |
| TINX | Trinity Industries Leasing Co. | added 1/99; 7/2000 |
| TIOC | Tioga Central R.R. Co. | added 4/87; eliminated 7/92 |
| TIPP | Tippecanoe R.R. Co. | added 4/80; eliminated 7/90 |
| TIRL | Tonawanda Island R.R., Inc. | added 7/84; eliminated 10/91; 1/94-7/2000 |
| TISH | Tishomingo R.R. Co., Inc. | added 4/2000; 7/2000 |
| TISX | Trinity Industries Leasing Co. | added 1/99; 7/2000 |
| TJRX | Shirley M. Brooks | added 1/86; eliminated 4/86 |
| TJRX | S.M. Brooks | added 4/86; 1/94-7/2000 |
| TK | Tuskegee R.R. | 10/57-4/61 |
| TKCX | Thiele Kaolin Co. | added 4/68; 4/70-7/2000 |
| TKEN | Tennken R.R. Co., Inc. | added 4/84; 1/94-7/2000 |
| TKX | Thomas Keery Co., Inc. | Apr-38 |
| TLCX | Trinidad Leaseholds (Canada) Ltd. | Jan-52 |
| Transport Leasing Co. | added 10/59; 4/61 | |
| Transport Leasing, a Division of Pullman Inc. | 7/65-4/70; eliminated 10/70 | |
| Pullman Transport Leasing Co., a Subsidiary of Pullman Inc. | added 10/70; 1/75 | |
| Pullman Leasing Co., a Subsidiary of Pullman Inc. | 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; eliminated 1/2000 | |
| General Electric Rail Services Corp. | added 1/2000; 7/2000 | |
| TLDX | Transport Leasing, a Division of Pullman Inc. | 7/65-4/70; eliminated 10/70 |
| Pullman Transport Leasing Co., a Subsidiary of Pullman Inc. | added 10/70; 1/75 | |
| Pullman Leasing Co., a Subsidiary of Pullman Inc. | 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; eliminated 1/2000 | |
| General Electric Rail Services Corp. | added 1/2000; 7/2000 | |
| TLLX | Trinity Industries Leasing Co. | added 4/2000; 7/2000 |
| TLSX | Tank Line Service, Inc. | 1/52-4/61; eliminated 1/62 |
| TLTX | Tilcon Tomasso Quarries Inc. | added 7/87; 1/94-7/2000 |
| TM | The Texas Mexican Ry. Co. | 1/52-7/2000 |
| TMAX | Tennessee River Pulp & Paper Co. | added 7/75; 1/80; eliminated 10/91 |
| Packaging Corp. of America | added 10/91; 1/94; eliminated 7/98 | |
| Tenneco Packaging Inc. | added 7/98 | |
| Tenneco Packaging Co. | Jul-00 | |
| TMBL | Tacoma Municipal Belt Line Ry. | 1/75-7/2000 |
| TMC | Temiscouata Ry. | Apr-38 |
| TMCX | The Mars Co. | Apr-38 |
| The Maxson Corp. | 1/75; eliminated 1/78 | |
| Temco Corp. | added 10/84; 1/94; eliminated 10/96 | |
| TMEX | Trinity Industries Leasing Co. | added 1/99; 7/2000 |
| TMGX | Transporte Multimodal de Granos | 1/94-7/2000 |
| TMIX | TransMatrix, Inc. | added 4/89; 1/94-7/2000 |
| TMLX | Temco Corp. | added 1/88; 1/94; eliminated 10/96; 7/2000 |
| TMOX | Textiles Monterrey, S.A. | Jan-52 |
| TMPX | Texas Municipal Power Agency | added 1/82; eliminated 5/83; added 10/83; 1/94; eliminated 10/96; 7/2000 |
| TMRX | Peter Kiewitt Sons' Co. | 1/80; eliminated 7/81 |
| TMSS | Towanda-Monroeton Shippers Lifeline, Inc. | 1/80-7/2000 |
| TMSX | Thomas Maddock's Sons Pottery (Standard Sanitary Mfg. Co.) | Apr-38 |
| TMT | Trailer Marine Transportation Corp. | 1/80-7/2000 |
| TMX | Mars Inc. | Apr-38 |
| Union Refrigerator Transit Lines, a Division of the General American Transportation Corp. | 1/52-10/66 | |
| Union Refrigerator Transit Lines | eliminated 7/67 | |
| TN | Texas & Northern Ry. Co. | 1/52-1/94; eliminated 1/99; 7/2000 |
| TNAX | TransAmerican Refining Corp. | added 7/90; 1/94; eliminated 1/2000; eliminated 4/2000; 7/2000 |
| TNCX | North American Car Corp. | added 7/65; 7/65-1/80 |
| General Electric Railcar Services Corp. | 1/94; eliminated 1/2000 | |
| General Electric Rail Services Corp. | added 1/2000; 7/2000 | |
| TNER | Texas Northeastern Division, Mid-Michigan R.R., Inc. | added 1/91; 1/94-7/2000 |
| TNGX | Texas Natural Gasoline Corp. | 1/52-10/57; eliminated 7/60 |
| Union Texas Natural Gas Corp. | added 7/60; 4/61 | |
| Union Texas Petroleum, a Division of Allied Chemical Corp. | eliminated 7/64 | |
| TNM | Texas-New Mexico Ry. Co. | Jan-75 |
| Missouri Pacific R.R. Co. | Jan-80 | |
| Missouri Pacific System | eliminated 7/84; eliminated 1/90 | |
| Union Pacific R.R. Co. | added 7/90; 1/94-7/2000 | |
| TNMR | Texas & New Mexico Division, Austin & Northwestern R.R. Co., Inc. | added 1/90; 1/94-7/2000 |
| T&NO | Texas & New Orleans R.R. | 4/38-4/61 |
| TNO | Texas & New Orleans R.R. | 10/57-4/61 |
| T&NO | Southern Pacific Co. (Texas and Louisiana Lines) | Jul-65 |
| T&NO | Texas and New Orleans R.R. Co. (Southern Pacific Co.) | Oct-66 |
| TNR | TennRail Corp. | added 4/92; 1/94; eliminated 7/94 |
| Kansas City Southern Ry. Co. | added 7/94; 7/2000 | |
| TOC | New York Central System | Oct-66 |
| Penn Central Transportation Co. | 4/70-1/75 | |
| Penn Central Transportation Co., Robert W. Blanchette, Richard C. Bond and John H. McArthur, Trustees | eliminated 4/76 | |
| Consolidated Rail Corp. | added 4/76; 1/80; eliminated 1/83; added 5/83; eliminated 7/99; 1/94 | |
| TOCX | True's Oil Co. | 4/38-10/57; eliminated 7/58 |
| TOE | Texas, Oklahoma & Eastern R.R. Co. | 1/75-7/2000 |
| TOLX | Petrolite Corp., Ltd., Tretolite Co. Division | Jan-52 |
| The TXL Oil Corp. | added 1/62 | |
| Texaco Inc. | eliminated 7/63 | |
| TOR | Trans-Ontario Ry. Co. | added 4/97; eliminated 7/98 |
| TOR | RailLink Canada Ltd. | Jul-00 |
| TORX | Toronto Elevators Ltd. | 10/57-4/61 |
| Maple Leaf Mills Ltd. | 7/65-1/75; eliminated 7/77 | |
| TOTX | Cotco, Inc. | added 4/97; 7/2000 |
| TOV | Tooele Valley Ry. Co. | 1/75-1/80; eliminated 1/82 |
| TOVX | Tovrea Packing Co. (Mather Stock Car Co.) | Apr-38 |
| TOZX | Eureka Springs Water Co. | Apr-38 |
| Ozarka Co. | Apr-61 | |
| Ozarka Water Co., Inc. | 7/65-10/66; eliminated 4/67 | |
| Ozarka Water Co. | added 4/67; 4/70 | |
| T&P | Texas & Pacific Ry. | 4/38-4/70 |
| TP | Texas & Pacific Ry. Co. | 10/57-1/75; eliminated 1/77 |
| Missouri Pacific R.R. Co. | Jan-80 | |
| Missouri Pacific System | added 1/77; 1/94; eliminated 4/97 | |
| Union Pacific R.R. Co. | added 4/97; 7/2000 | |
| TPAX | Trans Pacific Leasing Inc. | added 1/70; 4/70-1/75; eliminated 7/76 |
| TPBX | General American Transportation Corp. | added 4/70; 1/75-1/80; eliminated 10/92 |
| TPCX | Colgate-Palmolive-Peet Co. | 4/38-1/52; eliminated 1/53 |
| TPCX | The Purdy Co. | 1/75-1/80; eliminated 1/90 |
| TPDX | Tennessee Products Corp. | Apr-38 |
| Tennessee Products & Chemical Corp. | 1/52; eliminated 4/57 | |
| Union Tank Car Co. | added 4/57; 10/57-4/70; eliminated 7/73 | |
| TPEX | General Electric Railcar Services Corp. | 1/94-7/2000 |
| TPFX | North American Car Corp. | added 4/73; 1/75-1/80 |
| General Electric Railcar Services Corp. | 1/94; eliminated 1/2000 | |
| General Electric Rail Services Corp. | added 1/2000; 7/2000 | |
| TPGX | Technical Propellants, Inc. | added 10/90; 1/94-7/2000 |
| TPHX | Thomas Payne Holdings Inc. | Jul-00 |
| TPIX | Tropicana Products Sales, Inc. | 4/70; added 7/70; 1/75-7/2000; eliminated 4/2001 |
| Tropicana Transportation Corp. | added 4/2001 | |
| TPL | Texas and Pacific Ry. Co. | 1/75; eliminated 1/77 |
| Missouri Pacific R.R. Co. | added 1/77; 1/80 | |
| Missouri Pacific System | eliminated 1/81 | |
| TPLX | Pacific Lumber Co. | 1/52; eliminated 7/55 |
| American Refrigerator Transit Co. | 7/65-4/70; eliminated 10/74; 1/75-1/80 | |
| TPMP | Texas Pacific-Missouri Pacific Terminal R.R. of New Orleans | 1/75; eliminated 4/78 |
| TPPX | Thilmany Pulp & Paper Co. | added 7/74; 1/75-1/80; eliminated 4/86 |
| Thilmany Pulp & Paper Co. (captive service) | Jan-94 | |
| TPRX | Texas Power & Light Co. | 1/52-10/57; eliminated 1/58; added 7/80; 1/94 |
| TPSX | TPS Leasing Co., LLC | Jul-00 |
| TPT | Trenton-Princeton Traction Co. | Jan-75 |
| Consolidated Rail Corp. | Jan-80 | |
| TPTX | Trailer Train Co. | added 10/80; eliminated 4/81 |
| Trailer Train Co. | 1/94-7/2000 | |
| TP&W | Toledo, Peoria & Western R.R. | 4/38-4/70 |
| TPW | Toledo, Peoria & Western Ry. Co. | 1/75-1/80 |
| The Atchison, Topeka and Santa Fe Ry. Co. | eliminated 7/88 | |
| Toledo, Peoria & Western Ry. Co. | added 7/89; eliminated 4/91 | |
| Toledo, Peoria & Western Ry. Corp. | added 4/91; eliminated 10/92; 1/94; added 4/95; 7/2000 | |
| TPX | Trojan Powder Co. | 4/38-1/52 |
| Trojan Powder Co., care of Pennsylvania Trojan Powder Co. | Oct-57 | |
| Trojan Powder Co. | eliminated 7/58 | |
| TQEX | U.S. Rail Services | added 7/89; 1/94; eliminated 4/94 |
| USL Capital Rail Services | added 4/94; eliminated 10/96 | |
| First Union Rail | added 10/96; 7/2000 | |
| TR | Tomahawk Ry., Ltd. Partnership | added 4/92; eliminated 7/93; 1/94; eliminated 10/97; 7/2000; added 10/2000 |
| TRAX | American Refrigerator Transit Co. | added 4/54; 10/57-4/70; eliminated 7/70 |
| Railtex Corp. | added 7/78 | |
| Railtex Inc. | Jan-80 | |
| Railtex Corp. | Jan-94 | |
| Railtex Inc. | Jul-00 | |
| TRC | Trona Ry. Co. | 1/52-1/80; eliminated 1/85; 1/94-7/2000 |
| TRCX | Texas Refining Co. | Apr-38 |
| North American Car Corp. | added 7/56; 10/57-7/65; eliminated 10/65 | |
| Treco Sales, Inc. | 1/80; eliminated 1/92 | |
| Tri-County Commuter Rail Authority | Jul-00 | |
| TREX | Tetra Technologies, Inc. | added 1/90; 1/94; eliminated 4/2000; 7/2000 |
| TRFX | Tiona Refining Co. | Apr-38 |
| Turpentine & Rosin Factors, Inc. | 1/52-10/57 | |
| Nelio Chemicals, Inc. | Apr-61 | |
| TRGX | Terminal Grain Corp. | added 7/74; 1/75-1/80; eliminated 7/93 |
| Upper Merion and Plymouth Leasing Co. | added 7/93; 1/94; eliminated 4/96 | |
| First Union Rail | added 4/96; 7/2000 | |
| TRIN | Trinidad Ry., Inc. | 1/94-7/2000 |
| TRIX | Iowa Public Service Co. | added 7/75; 1/80 |
| Midwest Power Systems | added 1/94; eliminated 4/96 | |
| MidAmerican Energy Co. | added 4/96; eliminated 4/99 | |
| GATX Captial Corp. | added 4/99; 7/2000 | |
| TRLX | Texas Railcar Leasing Co. | added 7/89; 1/94-7/2000 |
| TRMW | City of Tacoma, d/b/a Tacoma Rail Mountain Division | Jul-00 |
| TRMX | The Railroad Museum--TRM Industries | 1/75; added 4/75; 1/80; eliminated 1/92; added 4/92; 1/94-7/2000; eliminated 1/2001; added 4/2001 |
| TRNX | Trinity Railcar Leasing Corp. | added 7/79; 1/80; eliminated 10/91 |
| General Electric Railcar Services Corp. | added 10/91; 1/94; eliminated 1/2000 | |
| General Electric Rail Services Corp. | added 1/2000; 7/2000 | |
| TRPX | Tropigas Inc. of Florida | added 1/66; 10/66-1/80; eliminated 1/89 |
| Petrolane Gas Service Ltd. Partnership | 1/94; eliminated 10/95 | |
| AmeriGas Propane, L.P. | added 10/95; eliminated 4/98; 7/2000 | |
| TRRA | Terminal R.R. Association of St. Louis | 4/38-7/2000 |
| TRSX | Transrail Systems, Inc. | added 10/69; 4/70; eliminated 4/72 |
| California Tank Car Line, Inc. | added 4/72; 1/75-1/80; eliminated 4/81 | |
| North American Car Corp. | added 4/81 | |
| General Electric Railcar Services Corp. | eliminated 1/86 | |
| Endasa, S.A. de C.V. | eliminated 4/89; 1/94 | |
| TRTX | W.J. Kirberger, Trustee | added 10/80; 1/94; eliminated 7/94; 7/2000 |
| TRUX | Midwest Bottle Gas Co. | added 1/78; 1/80-7/2000 |
| TRYX | Tri-County Cooperative Association | added 1/81; eliminated 7/88 |
| TS | Tidewater Southern Ry. Co. | 10/57-1/80; eliminated 10/87 |
| Union Pacific R.R. Co. | added 10/87; eliminated 4/88 | |
| TSBY | Tuscola and Saginaw Bay Ry. Co., Inc. | added 1/78; 1/80-7/2000 |
| TSCX | The Steel Company of Canada, Ltd. | 4/38-10/66; eliminated 10/69 |
| TSE | Texas South-Eastern Ry. Co. | 1/75; added 4/79; 1/80-7/2000 |
| TSNR | Tyson R.R., Inc. | 1/94-7/2000 |
| TSO | Tidewater Southern Ry. | 4/38-1/52 |
| TSPX | Texas Sulphur Products Co., Inc. | eliminated 4/79 |
| Texas Sulphur Products Co. | added 4/79; 1/80 | |
| TSRD | Twin State R.R. Co. | added 10/88; 1/94-7/2000 |
| TSRR | Tennessee Southern R.R. Co., Inc. | added 7/88; 1/94; eliminated 7/95; 7/2000 |
| TSSX | U.S. Dept. of Energy, Albuquerque Operations Office | added 10/84; 1/94; eliminated 10/97; 7/2000 |
| TSU | Tulsa-Sapulpa Union Ry. Co. | 1/75-1/94; eliminated 7/96 |
| Tulsa-Sapulpa Union Ry. Co., L.L.C. | added 7/96; 7/2000 | |
| TSUX | Tri-State Utility Inc. | Jan-94 |
| TSVX | Transerv Systems, Inc. | added 10/69; 4/70 |
| Tennsv, Inc. | 1/94-7/2000 | |
| TSWR | Toppenish, Simcoe & Western R.R. | added 10/93; 1/94; eliminated 4/95; 7/2000 |
| TSX | Tank Specializing Co. | 1/52-4/61 |
| TSXX | Tri-State Generation & Transmission Association, Inc. | 1/94; added 1/97; eliminated 10/98; 7/2000 |
| TT | Toledo Terminal R.R. Co. | 4/38-1/80; eliminated 10/84 |
| TTAX | Trailer Train Co. | added 4/68 |
| Trailer Train Co. (89'4" FC flats equipped with container adaptors, trailer hitches and bridge plates. Equipped with hydraulic draft gear) | Oct-68 | |
| Trailer Train Co. | Apr-70 | |
| Trailer Train Co. (flush deck flat cars equipped with foldaway container pedestals, knock-down hitches and bridge plates; for transporting trailers or containers or combinations of both) | Jan-75 | |
| Trailer Train Co. (flush deck flat cars equipped with foldaway container pedestals, hitches and bridge plates; for transporting trailers or containers or combinations of both) | Jan-80 | |
| Trailer Train Co. | eliminated 1/92 | |
| TTX Co. | added 1/92 | |
| TTX Co. (skeletonized, 5-unit, articulated all-purpose car for use between lift on/lift off facilities only, capable of carrying various combinations of trailers and/or containers of various lengths and widths) | 1/94-7/2000 | |
| TTBX | Trailer Train Co. | added 4/68 |
| Trailer Train Co. (89'3" and over FA flats equipped with bi-level automobile carrying superstructures furnished by member railroads. Cars are not equipped with hitches and bridge plates. Equipped with hydraulic draft gear) | Oct-68 | |
| Trailer Train Co. | Apr-70 | |
| Trailer Train Co. (flat cars equipped with bi-level auto racks furnished by participant railroads) | 1/75-1/80; eliminated 1/92 | |
| TTX Co. (flat cars equipped with bi-level auto racks furnished by participant railroads) | added 1/92; 1/94-7/2000 | |
| TTCX | Texas Chemical Co. (Consolidated Chemical Industries Inc.) | Apr-38 |
| Trailer Train Co. | Apr-70 | |
| Trailer Train Co. (flush deck flat cars equipped with movable foldaway container pedestals for transporting containers) | 1/75-1/80 | |
| Trailer Train Co. | eliminated 1/92 | |
| TTX Co. | added 1/92 | |
| TTX Co. (60', 89'1" and 89'4" COFC cars. 60' cars (5 digit car numbers) are equipped with fixed container pedestals and are capable of carrying 3-20' or 1-40' & 1-20' container fully loaded to a maximum gross weight per car (containers & lading) of 159,000 lbs. 89'4" cars (6 digit car numbers beginning with 9) are equipped with movable foldaway container pedestals capable of carrying various combinations of containers of varying lengths loaded to a maximum gross weight per car (containers & lading) of 150,000 lbs.) | 1/94-7/2000 | |
| TTDX | Trailer Train Co. | added 1/67 |
| Trailer Train Co. (FMS flat cars specifically equipped to carry military vehicles semi-saddleback) | Oct-68 | |
| Trailer Train Co. | Apr-70 | |
| Trailer Train Co. (flat cars, equipped with 16 tie-down winches with chains and bridge plates; for transporting military vehicles semi-saddleback style) | 1/75-1/80 | |
| Trailer Train Co. | eliminated 1/92 | |
| TTX Co. | added 1/92 | |
| TTX Co. (flat cars equipped with 16 tie-down winches with chains and bridge plates; for transporting military vehicles) | Jan-94 | |
| TTX Co. (flat cars equipped with 16 tie-down winches with chains and bridge plates; for transporting military vehicles, equipped with end of car cush.) | Jul-00 | |
| TTEX | Eason Oil Co. | Apr-38 |
| Tulsa Tank Line | 1/52-10/57 | |
| Tulsa Tank Line, H.H. Thiesen | Apr-61 | |
| Tulsa Tank Line | 7/65-10/66; eliminated 4/70 | |
| Trailer Train Co. | added 10/87; eliminated 1/92 | |
| TTX Co. | added 1/92 | |
| TTX Co. (semi-permanently coupled TOFC cars. Cars with 6 digit numbers in the 161000 series are capable of carrying 3 trailers up to 57' long or 4 trailers up to 45' long between lift on/lift off terminals only. Cars with 6 digit numbers in the 353000 and 354000 series are capable of carrying 3 trailers up to 57' long only) | 1/94-7/2000 | |
| TTFX | Trailer Train Co. | added 4/81; eliminated 1/92 |
| TTX Co. | added 1/92 | |
| TTX Co. (lightweight, four platform TOFC car capable of carrying 4 45' trailers. 2 trailers may be equipped with nose-mounted refrigeration units, and the other 2 trailers without nose-mounted reefer units. This intermodal flat is for operation between lift on/lift off terminals only) | Jan-94 | |
| TTGX | Trailer Train Co. | Apr-70 |
| Trailer Train Co. (no definition) | Jan-75 | |
| Trailer Train Co. | 4/70; added 1/77 | |
| Trailer Train Co. (flat cars equipped with fully enclosed bi-level auto racks furnished by participant railroads) | 1/80; eliminated 1/92 | |
| TTX Co. (flat cars equipped with fully enclosed bi-level auto racks furnished by participant railroads) | added 1/92; 1/94 | |
| TTX Co. (flat cars equipped with fully enclosed bi-level auto racks furnished by participant railroads, equipped with end of car cush.) | Jul-00 | |
| TTHX | Trailer Train Co. (heavy duty chain equipped cars) | added 10/66; 10/66 |
| Trailer Train Co. (FMS flats specifically equipped with heavy duty chains anchored to removable stake pocket castings -- when tiedowns are removed car becomes same as MTTX) | Oct-68 | |
| Trailer Train Co. | Apr-70 | |
| Trailer Train Co. (flat cars, equipped with heavy duty chains anchored to removable stake pocket castings. When tie-downs are removed, car becomes same as 60' car stencilled "MTTX") | 1/75-1/80 | |
| Trailer Train Co. | eliminated 1/92 | |
| TTX Co. | added 1/92 | |
| TTX Co. (flat cars equipped with 18 heavy-duty chains anchored to removable stake pocket castings. When tie-downs are removed, car becomes same as 60' flat cars stencilled MTTX) | 1/94-7/2000 | |
| TTIS | Transkentucky Transportation R.R. Co., Inc. | 1/80; added 4/80; eliminated 7/80 |
| Transkentucky Transportation Co., Inc. | 1/80; added 7/80; 1/94; eliminated 7/98; 7/2000 | |
| TTIX | Transcontinental Transport, Inc. | 10/57-4/61; eliminated 4/65 |
| North American Car Corp. | added 4/65; 7/65-1/80 | |
| General Electric Railcar Services Corp. | eliminated 4/89 | |
| TTJX | Trailer Train Co. | added 4/70; 4/70 |
| Trailer Train Co. (68', 90-ton flat cars with special tie-down devices, fixtures and stake pockets) | 1/75-1/80; eliminated 1/92 | |
| TTX Co. (68', 90-ton flat cars with special tie-down devices, fixtures and stake pockets) | added 1/92; 1/94 | |
| TTX Co. (68', 90-ton flat cars with special tie-down devices, fixtures and stake pockets, equipped with end of car cush.) | Jul-00 | |
| TTKX | Trailer Train Co. | added 4/68 |
| Trailer Train Co. (89'3" or over FA flats equipped with tri-level automobile carrying superstructures with moveable end sections of second or second and third decks, furnished by member railroads. Cars are not equipped with hitches or bridge plates. Equipped with hydraulic draft gears) | Oct-68 | |
| Trailer Train Co. | Apr-70 | |
| Trailer Train Co. (flat cars, equipped with hinged end tri-level auto racks furnished by participant railroads) | 1/75-1/80 | |
| Trailer Train Co. | eliminated 1/92 | |
| TTX Co. | added 1/92 | |
| TTX Co. (flat cars, equipped with hinged B deck tri-level auto racks furnished by participant railroads) | 1/94-7/2000 | |
| TTLX | Trailer Train Co. | added 1/83; eliminated 1/92 |
| TTX Co. | added 1/92 | |
| TTX Co. (specially equipped intermodal flatcars) | 1/94-7/2000 | |
| TTMX | Trailer Train Co. | 4/70; added 4/71 |
| Trailer Train Co. (68', 100-ton flat cars with stake pockets and lading strap anchors for general service) | 1/75-1/80; eliminated 1/92 | |
| TTX Co. (68', 100-ton flat cars with stake pockets and lading strap anchors for general service) | added 1/92; 1/94 | |
| TTX Co. (68', 100-ton flat cars with stake pockets and lading strap anchors for general service, equipped with end of car cush.) | Jul-00 | |
| TTNX | Texas Tanning Extract Co. | Jan-52 |
| Trailer Train Co. | added 5/83; eliminated 1/92 | |
| TTX Co. | added 1/92; 1/94 | |
| TTOX | Trailer Train Co. | added 10/87; eliminated 1/92 |
| TTX Co. | added 1/92 | |
| TTX Co. (single platform TOFC cars with modified single axle trucks and rigid hitch, capable of carrying 1 trailer 40-48' long, up to 102" wide with nose-mounted refrigeration unit; between lift on/lift off facilities only) | 1/94-7/2000 | |
| TTPX | Trailer Train Co. | Apr-70 |
| Trailer Train Co. (flat cars equipped with bulkheads spaced 62' apart and 17 transverse tie-down anchors with chains; used for transporting wallboard, plywood, etc.) | 1/75-1/80; eliminated 1/92 | |
| TTX Co. (flat cars equipped with bulkheads spaced 62' apart and 17 transverse tie-down anchors with chains; used for transporting wallboard, plywood, etc.) | added 1/92; 1/94 | |
| TTX Co. (flat cars equipped with bulkheads spaced 62' apart and 17 transverse tie-down anchors with chains; used for transporting wallboard, plywood, etc., equipped with end of car cush.) | Jul-00 | |
| TTQX | Trailer Train Co. | added 4/91; eliminated 1/92 |
| TTX Co. | added 1/92 | |
| TTX Co. (flat cars equipped with excessive height fully enclosed tri-level auto racks furnished by participant railroads -- requires special clearance authority for movement either loaded or empty) | Jan-94 | |
| TTX Co. (flat cars equipped with excessive height fully enclosed tri-level auto racks furnished by participant railroads -- requires special clearance authority for movement either loaded or empty, equipped with end of car cush.) | Jul-00 | |
| TTR | Tijuana & Tecate Ry. Co. | 1/75-1/80 |
| Talleyrand Terminal R.R. Co., Inc. | Jul-00 | |
| TTRX | Trailer Train Co. | added 4/68 |
| Trailer Train Co. (89'3" or over FA flats equipped with tri-level automobile carrying superstructure furnished by member railroads. Cars are not equipped with hitches and bridge plates. Equipped with hydraulic draft gears) | Oct-68 | |
| Trailer Train Co. | Apr-70 | |
| Trailer Train Co. (flat cars, equipped with fixed tri-level auto racks furnished by participant railroads) | 1/75-1/80 | |
| Trailer Train Co. | eliminated 1/92 | |
| TTX Co. | added 1/92; 1/94 | |
| TTX Co. (skeletonized, 3-unit, articulated all-purpose car for use between lift-on/lift-off facilities only. Each unit (platform) is capable of carrying 3-28'6" trailers, or one trailer up to 57' long, or one container 40' to 53' long) | Jul-00 | |
| TTSX | Trailer Train Co. | 4/70; added 1/74 |
| Trailer Train Co. (flat cars, equipped with Stac-Pac superstructure furnished by participant railroads) | Jan-75 | |
| Trailer Train Co. (flat cars equipped with coverless enclosed bi-level furnished by participant railroads) | 1/80; eliminated 1/92 | |
| TTX Co. (flat cars equipped with coverless enclosed bi-level furnished by participant railroads) | added 1/92; 1/94-7/2000 | |
| TTTX | Trailer Train Co. | added 7/86 |
| TTX Co. | added 10/97 | |
| TTUX | Trailer Train Co. | eliminated 1/92 |
| TTX Co. | added 1/92; 1/94 | |
| TTVX | Trailer Train Co. | |
| Trailer Train Co. (flat cars equipped with Vert-A-Pak superstructure, furnished by participant railroads) | 1/75-1/80 | |
| Trailer Train Co. | eliminated 1/92 | |
| TTX Co. | added 1/92; 1/94 | |
| TTWX | Trailer Train Co. | added 10/82; eliminated 1/92 |
| TTX Co. | added 1/92 | |
| TTX Co. (flush deck flat cars equipped with movable foldaway container pedestals and collapsable hitches, capable of handling 2 45' dry trailers with 36" kingpin spacing, at either lift on/lift off or end loading facilities using portable bridge plates provided by carrier, and/or various combinations of 20' and 40' containers. In TOFC service the load limit is 130000 lbs. (65000 lbs. per hitch). In COFC service the load limit is approximately 150000 lbs., depending on the light weight of the car) | 1/94-7/2000 | |
| TTX | Texas Pacific Coal and Oil Co. | Apr-38 |
| Trailer Train Co. | 10/57-7/65 | |
| Trailer Train Co. (FC flat cars equipped with hitches and bridge plates for the transportation of trailers) | 10/66-1/80 | |
| Trailer Train Co. | eliminated 1/92 | |
| TTX Co. | added 1/92 | |
| TTX Co. (flat cars equipped with collapsable hitches for the transportation of trailers) | 1/94-7/2000 | |
| TTZX | Trailer Train Co. | eliminated 1/92 |
| TTX Co. | added 1/92 | |
| TTX Co. (flat cars equipped with bulkheads and centre beams with tie-down systems for lumber loading) | Jan-94 | |
| TTX Co. (flat cars equipped with bulkheads and centre beams with tie-down systems for lumber loading, equipped with end of car cush.) | Jul-00 | |
| TUGX | Texas Utilities Generating Co. | 1/80; eliminated 1/88; 1/94 |
| Texas Utilities Mining Co. | added 1/88; 1/94-7/2000 | |
| TUPX | Texas Ultra Pure, Inc. | Jul-00 |
| TUST | Texarkana Union Station Trust | 1/75-7/2000 |
| TVAX | Tennessee Valley Authority | 7/65-7/2000 |
| TVBX | TVGX Group | Jul-00 |
| TV&G | Tavares & Gulf R.R. | 4/38-4/70 |
| TVM | Ferrocarrils Nacionales De Mexico | Jul-00 |
| TVOX | Texas Vegetable Oil Co. | 1/52; eliminated 4/54 |
| TVRR | Tulare Valley R.R. Co. | added 4/93; eliminated 7/93; 1/94-7/2000 |
| TVX | Ferrocarriles Nacionales de Mexico | added 4/96 |
| TWGX | Tidewater Grain Co. | added 4/79; 1/80; eliminated 7/86 |
| TWMX | The Whitmore Manufacturing Co. | 1/52-4/61 |
| TWOX | Tidewater Oil Co. | 4/38-10/66; eliminated 10/67 |
| Getty Oil Co. | added 10/67; 4/70; eliminated 4/72 | |
| TWRY | Tradewater Ry. Co. | added 4/82; 1/94; eliminated 4/95 |
| Western Kentucky Ry., L.L.C. | added 4/95 | |
| TWSX | A.E. Staley Manufacturing Co. | added 1/98; 7/2000 |
| TXCX | Teas Extract Co. | 4/38-1/52; eliminated 7/56 |
| TXGN | Texas, Gonzales & Northern Ry. Co. | added 7/93; 1/94-7/2000 |
| TXIX | Texas Industries, Inc. | 1/94-7/2000 |
| TXNW | Texas North Western Ry. Co. | added 1/83; 1/94; eliminated 7/95; 7/2000 |
| TXOR | Texas and Oklahoma R.R. Co. | 1/94-7/2000 |
| TXPX | Texas Petrochemicals Corp. | 1/94; eliminated 10/98; 7/2000 |
| TXR | Texas Rock Crusher Ry. Co. | Jul-00 |
| TXRC | The Texas Export R.R. Co. | Jan-75 |
| TXTC | Texas Transportation Co. | added 7/82; eliminated 1/91; 1/94-7/2000 |
| TXTX | Econo-Rail Corp. | added 4/80; eliminated 10/91 |
| TXUX | TU Electric | added 4/96; 7/2000 |
| TYBR | Tyburn R.R. Co. | 1/94-7/2000 |
| TYC | Tylerdale Connecting | 1/80-7/2000 |
| TYPX | Tyco Plastics | added 4/2000; 7/2000 |