| WA | The Western Ry. of Alabama | 1/75-1/80; eliminated 1/83 |
| Seaboard System R.R., Inc. | added 1/83; eliminated 7/87 | |
| CSX Transportation, Inc. | added 7/87; 1/94-7/2000 | |
| WAB | Wabash R.R. | 10/57-7/65 |
| Wabash R.R. Co. (Norfolk and Western Ry. Co.) | 10/66-4/70 | |
| Norfolk and Western Ry. Co. | 1/75-1/80; eliminated 1/91 | |
| Norfolk Southern Ry. Co. | added 1/91; 1/94-7/2000 | |
| WACR | Washington County R.R. Corp. | added 4/81; 1/94; eliminated 7/97; 7/2000 |
| WACX | Albright & Wilson Company | added 4/90; 1/94-7/2000 |
| WADX | American Refrigerator Transit Co. | added 7/55; 10/57-1/80 |
| WAER | Wabash & Erie R.R. | added 1/95; eliminated 4/95; 7/2000 |
| WAFX | Western Ash Co. | added 1/97; eliminated 7/97; 7/2000 |
| WAG | Wellsville, Addison & Galeton R.R. Corp. | 10/57-1/80; eliminated 4/80 |
| WAGX | Occidental Chemical Corp. | added 10/95; eliminated 4/96 |
| PCS Phosphate Co., Inc. | added 4/96; 7/2000 | |
| WAKX | Wake Partnership | added 4/93; 1/94-7/2000 |
| WAL | Western Allegheny R.R. Co. | 1/75-1/80 |
| WAMX | Webb Asset Management | Jul-00 |
| WAND | Wisconsin & Michigan Ry. Co. | added 10/92; 1/94; eliminated 1/97; 7/2000 |
| WAR | Warrenton R.R. Co. | 1/75-1/80; eliminated 7/87; eliminated 1/88; added 10/88; eliminated 7/91; 1/94-7/2000 |
| WAS | Waynesburg Southern | 1/75-1/80 |
| WASX | Wm. A. Smith Construction Co., Inc. | eliminated 4/87 |
| WATC | The Washington Terminal Co. | 1/75-7/2000 |
| WATR | Waterville | 1/75-1/80 |
| Water Carriers | 1/94-7/2000 | |
| WAVX | Waverly Oil Works Co. (General American Transportation Corp.) | Apr-38 |
| WAW | Waynesburg & Washington R.R. Co. | Jan-75 |
| WAW | Consolidated Rail Corp. | Jan-80 |
| WBC | Wilkes-Barre Connecting R.R. | 1/75-1/80 |
| WBCR | Wabash Central R.R. Corp. | added 7/98; 7/2000 |
| WBCX | Williams Bros. Concrete, Inc. | added 11/73; 1/75-1/80 |
| Williams Bros., Inc. | eliminated 4/91 | |
| Williams Bros. Division, Blue Circle Inc. | added 4/91; eliminated 1/94 | |
| Blue Circle Inc. | added 1/94; 7/2000 | |
| WBLX | William Bonifas Lumber Co. | eliminated 4/55 |
| Kimberly-Clark of Michigan, Inc. | added 4/55; 10/57-4/61 | |
| Kimberly-Clark Corp. | eliminated 4/65 | |
| WBMX | Wilkes-Barre Milling Co. | added 4/67; 4/70-1/75; eliminated 4/78 |
| Lauhoff Grain Co. | added 4/78; 1/80-1/94; eliminated 10/97; 7/2000 | |
| WBRX | William B. Riley Co., Inc. | 1/52-4/61 |
| WBTS | Waco, Beaumont, Trinity & Sabine Ry. Co. | 1/75-7/2000 |
| WC | Wisconsin Central Ltd. | added 1/88; 1/94-7/2000 |
| WCAX | Westcan Rail Ltd. | Jul-00 |
| WCCL | Wisconsin Chicago Link Ltd. | added 4/2000; 7/2000 |
| WCCX | Warren Car Co. | added 10/57; 10/57-1/80; eliminated 10/82 |
| Westmoreland Coal Co. | Jan-94 | |
| Consolidation Coal Co. | added 1/98; 7/2000 | |
| WCDX | Westcentral Cooperative Grain Co. | added 1/66; 10/66; eliminated 10/68 |
| Far-Mar-Co., Inc. | added 10/68; 4/70-1/80 | |
| Farmland Industries, Inc. | 1/94-7/2000 | |
| WCFX | Western Co-operative Fertilizers (U.S.), Inc. | eliminated 10/92 |
| Western Cars (U.S.) Inc. | added 10/92; eliminated 1/93 | |
| General Electric Railcar Services Corp. | added 1/93; 1/94; eliminated 1/2000 | |
| General Electric Rail Services Corp. | added 1/2000; 7/2000 | |
| WCGX | Westcentral Cooperative Grain Co. | added 10/65; eliminated 1/66 |
| WCHX | Walter Haffner Co. | 1/52-7/2000 |
| WCIX | Western Chemical Industries, Ltd. | added 1/53; eliminated 4/57 |
| Witco Chemical Co. | added 1/59; eliminated 7/59 | |
| Witco Chemical Co., Inc. | added 7/59; 4/61-10/66; eliminated 1/69 | |
| Witco Chemical Corp. | added 1/69; 4/70-1/75; eliminated 4/76 | |
| WCLC | Waccamaw Coast Line R.R. Co., Inc. | Jul-00 |
| WCLR | Waccamaw Coastline R.R. Co., Inc. | added 1/89; eliminated 7/92; 1/94 |
| Waccamaw Coast Line R.R. Co., Inc. | Jul-00 | |
| WCLX | Wilson Car Lines, Division of Wilson & Co., Inc. | 4/38-1/80; eliminated 7/81 |
| WCMX | West End Chemical Co. | Jan-52 |
| Wyandotte Chemicals Corp. | 4/61-4/70 | |
| WCOR | Wellsboro & Corning R.R. Co. | added 4/93; 1/94-7/2000 |
| WCQ | Wisconsin Central Ltd. | 1/94-7/2000 |
| WCRC | Washington Central R.R. Co., Inc. | added 1/87; 1/94; eliminated 10/97 |
| WCRC | Columbia Basin R.R. Co., Inc. | added 10/97; 7/2000 |
| WCRL | West Chester R.R. Co. | Jul-00 |
| WCRX | West Coast Resources, Inc. | added 1/72; 1/75 |
| United Grain Corp. | 1/80; eliminated 4/89 | |
| WCSX | Wheelabrator Coal Services Co. | 1/94-7/2000; eliminated 4/2001 |
| WCSX | Savage-Tolk Energy Services | added 4/2001 |
| WCTR | WCTU Ry. Co. | added 4/75; 1/80-7/2000 |
| WCTX | R.J. Roesling & Co. | Jan-52 |
| West Central Cooperative | added 4/80; eliminated 4/90 | |
| Resource Recycling Inc. | Jul-00 | |
| WCX | Wyandotte Chemicals Corp. | Jan-52 |
| Western Chemicals Ltd. | 10/57; eliminated 1/60 | |
| WDAX | Washington Dept. of Agriculture | Jul-00 |
| WDCX | Warren-Douglas Chemical Co., Inc. | Apr-70 |
| Warren-Douglas Chemical Co., Inc. | 7/65-10/66; eliminated 11/73 | |
| WDLX | Waddell Coal Mining Co., Inc. | 1/52-10/57 |
| WDAX | Washington Dept. of Agriculture | Jan-94 |
| WE | Wheeling and Lake Erie Ry. Co. | added 10/90; 1/94-7/2000 |
| WEAX | ACI Co. | added 4/76; eliminated 1/79 |
| WECX | Westinghouse Electric Corp. | 1/52-7/2000 |
| WEDX | Western Dairy Co. | Apr-38 |
| WEIX | Wilbur-Ellis Co. | added 4/80; 1/94-7/2000 |
| WELX | Welland Chemical, Inc. | eliminated 1/89 |
| White Equipment Leasing Corp. | Jul-00 | |
| WEMX | Westinghouse Electric & Manufacturing Co. | Apr-38 |
| WEOX | White Eagle Oil Corp. (Soncony-Vacuum Oil Co., Inc., White Eagle Division) | Apr-38 |
| WEPX | Wisconsin Electric Power Co. | added 4/68; 4/70-7/2000 |
| WESX | B.C. Timber Ltd. | eliminated 7/84 |
| WESX | Westar Timber Ltd. | added 7/84; eliminated 7/86; 1/94-7/2000 |
| WFAX | Western Fuels Association, Inc. | added 4/79; 1/80-7/2000 |
| WFB | Burlington Northern Inc. | 1/80; eliminated 4/81 |
| WFBX | Western Fruit Express Co. | 7/65-1/80 |
| WFCX | Western Fruit Express Co. | 4/61-4/70; eliminated 4/74; 1/75 |
| Western Farmers Electric Corp. | added 7/81; 1/94 | |
| Western Farmers Electric Cooperative | Jul-00 | |
| WFE | Burlington Northern Inc. | 1/80; eliminated 7/81 |
| Burlington Northern R.R. Co. | added 7/81; eliminated 4/95 | |
| WFEX | Western Fruit Express Co. | 4/38-1/80; eliminated 1/81 |
| WFIX | WFIX Partners | added 4/81; eliminated 4/88 |
| Pullman Leasing Co. | added 4/88; 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; eliminated 1/2001 | |
| First Union Rail | added 1/2001 | |
| WFLX | West Fork Logging Co. | Apr-38 |
| St. Regis Paper Co., West Fork Logging Division | Jan-52 | |
| WFMX | Western Fruit Express Co. | added 4/67; 4/70; eliminated 4/74; 1/75 |
| WFPX | Western Food Products Co. | 1/52-7/65; eliminated 10/65 |
| WFS | West Isle Line, Inc. | Jul-00 |
| WGBX | W.G. Block Co. | 1/75-1/80 |
| W.G. Block Co. (captive service) | Jan-94 | |
| WGCR | Wiregrass Central R.R. Co. | added 4/88; 1/94-7/2000 |
| WGFX | Willard Grain & Feed Inc. | added 7/84; 1/94-7/2000 |
| WGR | Willamina & Grand Ronde Ry. Co. | added 4/88; 1/94-7/2000 |
| WGRR | Willamina & Grand Ronde R.R. Co. | added 1/81; eliminated 4/86 |
| WGRY | Wabash & Grand River Ry. Co. | added 1/91; eliminated 7/91; 1/94 |
| WGSX | Leonard Warden, Distributors | 1/52-4/61 |
| WHI | Burlington Northern Inc. | 1/80; eliminated 7/81 |
| Burlington Northern R.R. Co. | added 7/81; eliminated 4/95 | |
| WHIX | Western Fruit Express Co. | 1/52-1/80; eliminated 1/81 |
| WHMX | Miner Enterprises | 1/94; added 1/97; eliminated 4/97; 7/2000 |
| WHN | Wharton and Northern R.R. Co. | Jan-75 |
| WHN | Consolidated Rail Corp. | 1/80-1/94 |
| WHOE | Walking Horse and Eastern R.R. | eliminated 10/91; 1/94-7/2000 |
| WHRC | Windsor & Hantsport Ry. Co., Ltd. | added 7/94; 7/2000 |
| WHSX | North American Car Corp. | added 7/66; 10/66-1/80 |
| General Electric Railcar Services Corp. | eliminated 7/86 | |
| WHTX | ADM Milling Co. | added 7/94; 7/2000 |
| WICT | Wisconsin & Calumet R.R. Co., Inc. | 1/94; eliminated 4/95 |
| Wisconsin & Southern R.R. Co., Inc. | added 4/95 | |
| Wisconsin & Calumet R.R. Co., Inc. | eliminated 1/98 | |
| WIEX | Wilbur-Ellis Co. | eliminated 10/95 |
| WIF | West India Fruit & Steam Ship Co. | 1/52-4/61 |
| Atlantic Coast Line R.R. | 7/65-4/70 | |
| West India Fruit & Steamship | 1/75-7/2000 | |
| WIGX | Wigeon Car Co. | added 1/68; 4/70-1/80; eliminated 4/92 |
| WIIX | Williamette Industries, Inc. | added 10/91; eliminated 4/92 |
| Williamette Industries, Inc. | added 4/92; 1/94-7/2000 | |
| WILX | Wilmeth Petroleum Co. | eliminated 1/65 |
| WIM | Washington, Idaho & Montana Ry. Co. | 1/75-1/80; eliminated 7/81 |
| WIMX | Wimpey Minerals USA, Inc. | Jul-00 |
| WISX | Wisconsin Power and Light Co. | added 7/69; 4/70-1/80; eliminated 1/90; 1/94 |
| Alliant Energy | added 4/2000; 7/2000 | |
| WITX | Witco Carbon Co. | Jan-52 |
| Continental Carbon Co. | 4/61-1/80; eliminated 1/85 | |
| Continental Carbon Co., wholly owned subsidiary of Witco Chemical Corp. | added 1/85; eliminated 4/86 | |
| Continental Carbon Co., wholly owned subsidiary of Witco Corp. | added 4/86; 1/94 | |
| Continental Carbon Co. | eliminated 1/99 | |
| General Electric Railcar Services Corp. | added 1/99; eliminated 1/2000 | |
| General Electric Rail Services Corp. | added 1/2000; 7/2000 | |
| WIWR | Wisconsin Western R.R. Co. | added 10/82; eliminated 1/86 |
| WJ | West Jersey R.R. Co. | Jan-94 |
| West Michigan R.R. Co. | Jul-00 | |
| WJMX | The W.J. McCahan Sugar Refining & Molasses Co. | Apr-38 |
| William J. McCormack Sand Division, Penn Industries, Inc. | added 10/71; 1/75 | |
| WKRL | Western Kentucky Ry., L.L.C. | added 4/95; 7/2000 |
| WKWX | William K. Warren | Apr-38 |
| WKWX | The William K. Warren Foundation | Jan-52 |
| WLDX | Weldship Corp. | Jul-00 |
| WLE | Wheeling & Lake Erie Ry. | 4/38-10/57 |
| Wheeling & Lake Erie Ry. (New York, Chicago and St. Louis R.R. Co.) | 4/61-7/65 | |
| Wheeling & Lake Erie Ry. (Norfolk and Western Ry.) | Apr-70 | |
| Wheeling & Lake Erie | 1/75-1/80 | |
| WLFB | Wolfeboro R.R. Co., Inc. | 1/75-1/80 |
| WLO | Waterloo R.R. Co. | 10/57-1/80; eliminated 4/86 |
| Waterloo Ry. Co. | added 4/86; 1/94-7/2000 | |
| WLPX | Westlake Polymers Corp. | 1/94; added 1/99; 7/2000 |
| WLX | Wilsil Ltd. | Apr-38 |
| WM | Western Maryland Ry. Co. | 4/38-1/80 |
| Baltimore & Ohio R.R. Co. | eliminated 7/87 | |
| The Chesapeake and Ohio Ry. Co. | added 7/87; eliminated 10/87 | |
| CSX Transportation, Inc. | added 10/87; 1/94-7/2000 | |
| WMBX | Willbros Terminal Co. | added 10/67; 4/70; eliminated 7/74 |
| North American Car Corp. | 1/75; added 4/75; eliminated 7/76 | |
| WMGX | L.H. Wentz (Oil Division) | Apr-38 |
| WMI | West Michigan R.R. Co. | Jul-00 |
| WMIX | Waste Management of Illinois, Inc. | added 10/96; eliminated 4/2000; 7/2000 |
| WMKX | Whiting Milk Co. | Jan-52 |
| WM&N | Weatherford, Mineral Wells & Northwestern Ry. Co. | Apr-38 |
| WMRX | Merchants Despatch Transportation Corp. | 10/57-10/66; eliminated 10/69 |
| WMSC | White Mountain Scenic R.R. | 1/80-7/2000 |
| WMWN | The Weatherford, Mineral Wells and Northwestern Ry. Co. | 1/75-1/80 |
| WMX | Westmoreland Coal Co. | Apr-38 |
| W&NB | Williamsport & North Branch Ry. Co. | Apr-38 |
| WNCX | Wabash National Finance Corp. | Jul-00 |
| WNDX | Relco Rank Line, Inc. | added 1/91; 1/94; eliminated 10/97 |
| WNF | Winfield R.R. Co. | 4/38-1/80; eliminated 4/80 |
| WNFR | Winifrede R.R. Co. | 1/75-1/80; added 7/80; 1/94-7/2000; eliminated 10/2000 |
| Kanawha Rail Corp. | added 10/2000 | |
| WNGX | Western Natural Gas Co. | added 4/75; 1/80-1/94; eliminated 10/96; 7/2000 |
| W&NO | Wharton & Northern R.R. | 4/38-4/70 |
| WNV | Wichita Northwestern Ry. | Jan-52 |
| WNW | Wichita Northwestern Ry. | Apr-38 |
| WNYX | Western New York Ry. Historical Society | 1/94-7/2000 |
| WOB | Burlington Northern Inc. | eliminated 1/78; 1/80 |
| WOBX | Western Fruit Express Co. | 1/52-1/75; eliminated 1/79 |
| WOCX | Wadhams Oil Co. | Apr-38 |
| WOHO | Wabash & Ohio R.R. | added 1/95; eliminated 4/95; 7/2000 |
| WOLX | Westland Oil Co. | Jan-52 |
| W&OV | Warren & Ouachita Valley Ry. | 4/38-4/70 |
| WOV | Warren & Ouachita Valley Ry. Co. | 1/75-1/80; eliminated 10/80 |
| WOX | Warden Oil Co. | Apr-38 |
| General American Transportation Corp. | 1/52; eliminated 10/53 | |
| WP | Western Pacific R.R. Co. | 7/65-1/80; eliminated 10/87 |
| Union Pacific R.R. Co. | added 10/87; 1/94-7/2000 | |
| WPCX | Transportation Management, Inc. | 1/75; added 4/75 |
| Missouri Valley Walnut Co. | 1/80; eliminated 1/82 | |
| WPEX | Wabash Power Equipment Co. | added 7/90; 1/94-7/2000 |
| WPGX | Western Paving Construction Co. | added 4/74; 1/75-7/2000 |
| WPLX | North American Car Corp. | added 1/67; 4/70-1/80 |
| General Electric Railcar Services Corp. | 1/94; eliminated 10/94 | |
| WPMW | Western Pacific R.R. Co. | eliminated 10/87 |
| Union Pacific R.R. Co. | added 10/87; 1/94-7/2000 | |
| WPPX | WestPoint Pepperell, Inc. | added 1/78; 1/80; eliminated 4/82 |
| WPRB | Western Pacific R.R. Co. | 7/65-4/70 |
| WPRR | Willamette & Pacific R.R., Inc. | added 7/93; 1/94-7/2000 |
| WPRX | Wainwright Producers and Refiners Ltd. | 10/57-4/61; eliminated 4/62 |
| Union Tank Car Co. | added 4/62 | |
| Fruit Growers Express Co. | added 7/68; 4/70-1/75; eliminated 7/78 | |
| WPSX | Wisconsin Public Service Corp. | added 10/81; eliminated 4/93; 1/94-7/2000 |
| WPWX | Wilson Propane Wholesale Co. | 1/80; eliminated 7/81 |
| Fruit Growers Express Co. | added 7/81; eliminated 4/82 | |
| WPY | White Pass & Yukon Route | 1/75-1/80 |
| WRAX | The Wine Railway Appliance Co. | Apr-38 |
| WRBX | W.R. Bonsal Co. | added 4/68; 4/70; eliminated 4/71 |
| WRCX | Wisconsin Rendering Co., Inc. | 1/52-4/70; eliminated 1/71 |
| WRDX | Ward Tank Car Line | Apr-38 |
| Wyodak Resources Development Corp. | added 1/80; 1/80; eliminated 10/82 | |
| Iowa-Illinois Gas & Electric Co. | added 10/82 | |
| Iowa-Gas & Electric Co. | added 10/83; 1/94 | |
| Iowa-Illinois Gas & Electric Co. | eliminated 4/96 | |
| MidAmerican Energy Co. | added 4/96; 7/2000 | |
| WREX | Western Railroad Equipment Co. | added 1/99; 7/2000 |
| WRFX | White River Trading Inc. | Jul-00 |
| WRLX | Winona Refrigerator Car Corp. | Apr-38 |
| General American Transportation Corp. | 1/52-4/61 | |
| Western Rail Leasing Corp. | added 7/70; eliminated 10/71 | |
| Relco Leasing Corp. | added 10/71; eliminated 4/72 | |
| Relco Tank Line, Inc. | Jan-75 | |
| Relco Tank Line Division of Relco Nevada Corp. | 1/80; eliminated 10/86 | |
| Relco Tank Line, Inc. | added 10/86; eliminated 4/93; 1/94-7/2000 | |
| WRNX | Warren Petroleum Corp. | 4/38-10/66; eliminated 1/70 |
| Gulf Oil Co.--U.S., Division of Gulf Oil Corp. | added 1/70; 4/70-1/80; eliminated 7/82 | |
| Gulf Refining and Marketing Co., Division of Gulf Oil Corp. | added 7/82 | |
| Chevron U.S.A. Inc. | 1/94-7/2000 | |
| WRPI | Western R.R. Properties, Inc. | added 10/84; 1/94; eliminated 4/96; 7/2000 |
| WRPX | Public Service Co. of Indiana, Inc. | added 10/78; 1/80; eliminated 1/91 |
| PSI Energy, Inc. | added 1/91; 1/94; eliminated 10/98; 7/2000; added 10/2000; eliminated 1/2001 | |
| WRRC | Western Rail Road Co. | 1/80-7/2000 |
| WRSX | Wheeler, Reynolds & Stauffer | 4/38-4/61; eliminated 1/62 |
| Stauffer Chemical Co. (Western Branch) | added 1/62 | |
| Scholle Corp. | added 4/73; 1/75-1/80; eliminated 4/89 | |
| Warren Railcar Service, Inc. | Jul-00 | |
| WRT | Warrior River Terminal Co. | Jan-52 |
| WRTX | Western Rail Leasing Corp. | added 7/78; 1/80; eliminated 10/90 |
| WRWK | Warwick Ry. Co. | added 1/74; 1/75-1/80; eliminated 1/83 |
| Providence and Worcester R.R. Co. | added 1/83; 1/94-7/2000 | |
| Trinity Rail Management, Inc. | Jul-00 | |
| WRX | Western Refrigerator Line Co. | 4/38-4/70 |
| Western Refrigerator Line Co. Terminal | 1/75-1/80; eliminated 10/90; 1/94-7/2000 | |
| WRY | Waterloo Ry. Co. | 1/94-7/2000 |
| WS | Ware Shoals R.R. Co. | 1/75-1/80; eliminated 1/85 |
| Walkersville Southern R.R. | 1/94-7/2000 | |
| WSCX | Willibald Schaefer Co. | 4/38; added 1/68; 4/70; eliminated 10/72 |
| Buffalo Brake Beam Co. | added 10/80; eliminated 5/83; 1/94 | |
| WSIX | Watco Switching Indiana | Jul-00 |
| WSLX | Wheeling Steel Corp. | 4/38-4/61; eliminated 1/65 |
| WSOR | Wisconsin & Southern R.R. Co. | added 10/80; 1/94-7/2000 |
| WSOX | Wisconsin & Southern Leasing Co. | added 7/81; eliminated 1/91 |
| Upper Merion and Plymouth Leasing Co. | added 1/91; 1/94 | |
| Upper Merion and Plymouth Co. | eliminated 4/96 | |
| First Union Rail | added 4/96; 7/2000 | |
| WSPX | Wheelstar Corp. | 1/94-7/2000 |
| WSR | Warren & Sabine River R.R. Co. | 1/75-1/94; eliminated 1/99; 7/2000 |
| WSRY | Winamac Southern Ry. Co. | 1/94-7/2000 |
| WSRX | Socony-Vacuum Oil Co., Inc., White Star-Ohio Division | Apr-38 |
| WSS | Winston-Salem Southbound Ry. Co. | 4/38-7/2000 |
| WSSX | Wedron Silica Co. | added 4/86; 1/94-7/2000 |
| WSTX | Whitestone Supply Co. | Jul-00 |
| WSWX | Wisconsin Steel Co. | Apr-38 |
| WSX | Weirton Steel Co. | 4/38-10/57; eliminated 7/59 |
| Weirton Steel Co. Division, National Steel Corp. | added 7/59; 4/61 | |
| Weirton Steel Division, National Steel Corp. | 7/65-10/66 | |
| Weirton Steel Co. Division, National Steel Corp. | eliminated 1/67 | |
| Weirton Steel Division, National Steel Corp. | added 1/67; 4/70-1/80; eliminated 5/83; 1/94-7/2000 | |
| WSYP | White Sulphur Springs & Yellowstone Park Ry. Co. | 1/75-1/80; eliminated 7/80 |
| WT | Weldwood Transportation Ltd. | 1/75-1/80 |
| WTCO | Western Transportation Co. | 1/75-7/2000 |
| WTCX | Weyerhauser Timber Co. | added 10/58; eliminated 1/60 |
| Weyerhauser Co. | added 1/60; 4/61-4/70 | |
| Atlantic Terminals Inc. | Jan-75 | |
| Weyerhauser Co. | 1/80-7/2000; eliminated 10/2000 | |
| WTJR | Wichita, Tillman & Jackson Ry. Co., Inc. | added 7/91; eliminated 10/91; 1/94-7/2000 |
| WTKX | Warren Tank Car Co. | Apr-38 |
| WTL | West Texas and Lubbock R.R. Co. Inc. | Jul-00 |
| WTLR | West Texas and Lubbock R.R. Co. Inc. | added 1/96; eliminated 7/99; 7/2000 |
| WTNN | West Tennessee R.R. Corp. | added 10/84; eliminated 1/88; 1/94-7/2000 |
| WTOH | Western Ohio R.R. Co. | 1/80; eliminated 4/81 |
| WTR | Wrightsville and Tennille R.R. Co. | 4/38-4/70 |
| WTRM | The Warren & Trumball R.R. Co. | added 7/94; 7/2000 |
| WTRY | Wilmington Terminal R.R., Inc. | added 1/87; 1/94-7/2000 |
| WTSE | West Shore R.R. Corp. | 1/94; eliminated 4/2000; 7/2000 |
| WTTX | Trailer Train Co. | added 4/82; eliminated 1/92 |
| TTX Co. | added 1/92 | |
| TTX Co. (standard deck flat cars equipped with 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) | 1/94-7/2000 | |
| WTWX | Waggoner Refining Co., Inc. | Apr-38 |
| WUT | Wichita Union Terminal Ry., Co. | 1/94-7/2000 |
| WUTX | Western Union Telegraph Co. | 1/52-4/61 |
| WV | Wichita Valley Ry. | 4/38-1/52 |
| WVC | Durbin and Greenbrier Valley R.R., Inc. d/b/a West Virginia Central R.R. | added 1/99; 7/2000 |
| WVCX | Westvaco Chlorine Products Corp. | Apr-38 |
| Westvaco Chemical Corp. | Jan-52 | |
| Westvaco Corp. | added 1/82; 1/94-7/2000 | |
| WVN | West Virginia Northern R.R. Co. | 1/75-1/80; eliminated 1/88 |
| West Virginia Northern R.R., Ltd. | added 1/88; eliminated 1/92 | |
| Kingwood Northern d/b/a West Virginia Northern R.R., Ltd. | Jul-00 | |
| WVR | Willamette Valley Ry. Co. | 1/94-7/2000; eliminated 7/2001 |
| WVRC | Wabash Valley R.R. Co. | added 1/78; added 4/78; 1/80; eliminated 7/81 |
| WVRD | Willamette Valley Ry. Co. | added 4/85; 1/94 |
| WW | Winchester and Western R.R. Co. | 1/75; added 4/79; 1/80-7/2000 |
| WWBX | WWIB Transportation Services | 1/94-7/2000 |
| WWEX | Wood Waste Energy, Inc. | added 10/98; eliminated 4/2000 |
| Railworks Wood Waste Energy, Inc. | added 4/2000; 7/2000 | |
| WWLX | LaRoche Industries, Inc. | added 1/97; 7/2000 |
| WWPX | W. & W. Pickle & Canning Co. | 4/38-1/52; eliminated 4/57 |
| W. & W. Pickle Co. | added 4/57; 10/57-4/61 | |
| Whitfield Pickle Co. | eliminated 7/65 | |
| WWR | Washington Western | 1/75-1/80 |
| WWRC | Wilmington & Western Ry. Corp. | eliminated 1/93; 1/94-7/2000 |
| WWSX | Standard Car Truck Co. | added 7/80; eliminated 1/88 |
| WWUX | Unimin Corp. | added 7/92; 1/94-7/2000; eliminated 7/2000 |
| WWV | Walla Walla Valley Ry. Co. | 4/38-1/80; eliminated 7/82 |
| Burlington Northern R.R. Co. | Jan-94 | |
| WYCO | Wyoming & Colorado R.R. | 1/94-7/2000 |
| WYCX | Weyerhauser Canada Ltd. | added 1/72; 1/75-7/2000 |
| WYEC | Wye Transportation Co. | 1/94-7/2000 |
| WYO | Wyoming Ry. Co. | Apr-38 |
| WYS | Wyandotte Southern R.R. Co. | 1/75-1/80; eliminated 4/87; 1/94-7/2000 |
| WYT | Wyandotte Terminal R.R. Co. | 1/75-1/80; eliminated 10/81 |