List of reporting marks: W

W

 * WA  - Western Railway of Alabama; Seaboard System Railroad; CSX Transportation
 * WAB - Wabash Railroad; Norfolk Southern
 * WACR - Washington County Railroad
 * WACX - PCS Phosphate Company
 * WAG - Wellsville, Addison and Galeton Railroad
 * WAGX - PCS Phosphate Company
 * WAL - Western Allegheny Railroad
 * WAMX - Watco Transportation Services, L.L.C.
 * WAR - Warrenton Railroad
 * WAS - Waynesburg Southern
 * WATC - Washington Terminal Company
 * WATR - Waterville Railroad
 * WAW - Conrail
 * WBC - Wilkes-Barre Connecting Railroad
 * WBCX - Williams Brothers Concrete
 * WBMX - Wilkes-Barre Milling (Lauhoff Grain Company)
 * WBTS - Waco, Beaumont, Trinity and Sabine Railway
 * WC  - Wisconsin Central Railway; Canadian National Railway
 * WCCL - Wisconsin Central Railway; Canadian National Railway
 * WCDX - Far-Mar-Co, Inc.
 * WCE - West Coast Express
 * WCHX - Walter Haffner Company
 * WCRC - Washington Central Railroad
 * WCRX - United Grain Corporation
 * WCTR - WCTU Railway
 * WCTX - West Central Cooperative
 * WDRR - White Deer and Reading Railroad
 * WDTX - Washington State Department of Transportation
 * WE  - Wheeling and Lake Erie Railway (current)
 * WECX - Westinghouse Electric Corporation
 * WEIX - Wilbur-Ellis Company
 * WELX - Welland Chemical, Inc.
 * WEPX - Wisconsin Electric Power Company
 * WERZ - Werner Enterprises
 * WESX - BC Timber, Ltd.
 * WFAX - Western Fuels Association, Inc.
 * WFCX - Western Farmers Electric Cooperative
 * WFE - Western Fruit Express; Burlington Northern Railroad
 * WFIX - WFIX Partners; Wells Fargo Rail
 * WFRX - WFEC Railroad Company; Wells Fargo Rail
 * WGBX - W. G. Block Company
 * WGCR - Wiregrass Central Railroad
 * WGRR - Williams and Grand Ronde Railroad
 * WHCX - Western Hay Corporation
 * WHI - Burlington Northern Railroad
 * WHN - Conrail
 * WHSX - GE Rail Services
 * WICT - Wisconsin and Calumet Railroad
 * WIF - West India Fruit and Steamship Company
 * WIGX - Wigeon Car Company
 * WISX - Wisconsin Power and Light
 * WITX - Continental Carbon Company
 * WIWR - Wisconsin Western Railroad
 * WKRL - Western Kentucky Railway
 * WLE - Wheeling and Lake Erie Railway (former)
 * WLFB - Wolfeboro Railroad
 * WLO - Waterloo Railway
 * WLPX - West Lake Polymers
 * WLRL - Washington-Lincoln Railink
 * WM  - Western Maryland Railroad; Baltimore and Ohio Railroad; Chessie System; CSX Transportation
 * WMI - West Michigan Railroad
 * WMSC - White Mountain Scenic Railroad
 * WMSR - Western Maryland Scenic Railroad
 * WMTZ - Wal-Mart Transportation
 * WMWN - Weatherford, Mineral Wells and Northwestern Railway
 * WN  - Wisconsin Northern Railroad
 * WNF - Winfield Railroad
 * WNFR - Winnifrede Railroad
 * WNGX - Western Natural Gas Company
 * WNYP - Western New York and Pennsylvania Railroad
 * WOD - Washington and Old Dominion Railroad
 * WOPR - West Oakland Pacific Railroad
 * WP  - Western Pacific Railroad; Union Pacific Railroad
 * WPGX - Western Paving Construction Company
 * WPLX - GE Rail Services
 * WPMW - Western Pacific Railroad (Maintenance of way)
 * WPRR - Willamette and Pacific Railroad
 * WPSX - Wisconsin Public Service Corporation
 * WPY - White Pass and Yukon Route
 * WRA - Western Railway of Alabama; Seaboard System Railroad; CSX Transportation
 * WRDX - Iowa-Illinois Gas and Electric Company
 * WREX - Western Refrigerator Express
 * WRL - Western Refrigerator Line, Washington Royal Line
 * WRLX - Relco Tank Line
 * WRNX - Gulf Oil Products Company; Chevron USA, Inc.
 * WRPX - Public Service Company of Indiana
 * WRRC - Western Rail Road Company
 * WRSX - Scholle Corporation
 * WRTX - Western Rail Leasing Corporation
 * WRWK - Providence and Worcester Railroad
 * WRX - Western Refrigerator Line Company
 * WS  - Ware Shoals Railroad
 * WSCX - Buffalo Brake Beam Company
 * WSJR - Goderich-Exeter Railway
 * WSOR - Wisconsin and Southern Railroad
 * WSOX - Wisconsin and Southern Leasing Company
 * WSR - Warren and Saline River Railroad
 * WSRC - West Shore Railroad Corporation
 * WSS - Winston-Salem Southbound Railway
 * WSX - National Steel Corporation (Weirton Steel Division)
 * WSYP - White Sulphur Springs and Yellowstone Park Railway
 * WT  - Weldwood Transportation, Ltd., Wyandotte Terminal Railroad
 * WTA - Wichita Terminal Association
 * WTCO - Watco Railways
 * WTCX - Weyerhaeuser Company
 * WTOH - Western Ohio Railroad
 * WTRY - Wilmington Terminal Railroad
 * WTSE - West Shore Railroad Corporation
 * WTTX - Trailer Train Company
 * WURR - Wallowa Union Railroad
 * WUT - Wichita Union Terminal Railway
 * WUTX - Washington Utilities and Transportation Commission (scale test cars)
 * WVCX - Westvaco Corporation
 * WVN - West Virginia Northern Railroad
 * WVRR - Whitewater Valley Railroad
 * WW  - Winchester and Western Railroad
 * WWR - Washington Western, Western Washington Railroad
 * WWRC - Wilmington & Western Railroad
 * WWLX - LaRoche Industries, Inc.
 * WWPX - Willimantic Waste Paper, Inc.
 * WWSX - Standard Car Truck Company
 * WWUX - Unimin
 * WYCX - Weyerhauser Canada, Ltd.
 * WYS - Wyandotte Southern Railroad