| Abbreviation | Railroad Name |
| WMRL | W.M. Ritter Lumber Co.
|
| WAB | Wabash
|
| WBTS | Waco, Beaumont, Trinity & Sabine
|
| WADLEY SOU | Wadley Southern
|
| WWV | Walla Walla Valley (elec)
|
| WANDERER | Wanderer
|
| WARE SHOAL | Ware Shoals
|
| WOV | Warren & Ouschita Valley
|
| WSR | Warren & Saline River
|
| WAR | Warrenton
|
| WRT | Warrior River Terminal
|
| WT | Washaington Terminal
|
| WOD | Washington & Old Dominion Elec
|
| WCRC | Washington Central
|
| METRO | Washington DC Metro
|
| WIM | Washington, Idaho & Montana
|
| WLO | Waterloo Railroad
|
| WAT | Waterville
|
| WCTR | Wctu Railroad
|
| WAG | Wellsville Addison & Galeton
|
| WCEXP | West Coast Express
|
| WF | West Feliciana
|
| WIF | West India Fruit & Steamship
|
| WLAKE | West Lake
|
| WSL | West Side Lumber Co.
|
| WVN | West Virginia Northern
|
| WVPP | West Vriginia Pulp & Paper
|
| WA | Western Allegheny
|
| WARR | Western Atlantic Rr
|
| WFE | Western Fruit Express
|
| WFCX | Western Fruit Express WFCX
|
| WM | Western Maryland
|
| WNYP | Western NY & Pennsylvania
|
| WOFA | Western Of Atlanta
|
| WP | Western Pacific
|
| WRRC | Western Railroad
|
| WRA | Western Ry Of Alabama
|
| WESTINGHOU | Westinghouse
|
| WEYER | Weyerhaeuser Timber
|
| WHRN | Wharton & Northern
|
| WLE | Wheeling & Lake Erie
|
| WPY | White Pas & Yukon
|
| WFS | Wichita Falls & Southern
|
| WV | Wichita Valley
|
| WILLAMETE | Willamette
|
| WGR | Willamina & Gr Ronde
|
| WCLX | Wilson Car Lines
|
| WILSON | Wilson Meat Packing
|
| WCHW | Winchester & Western
|
| WINFIELD | Winfield
|
| WNFR | Winifrede Railroad
|
| WI | Winona (elec)
|
| WSS | Winston-salem Southbound
|
| WICT | Wisconsin & Calumet
|
| WSOR | Wisconsin & Southern
|
| WC | Wisconsin Central
|
| WEPX | Wisconsin Electric PowerWEPX
|
| WPSX | Wisconsin Public Service WPSX
|
| WISX | WISX
|
| WRB | Wood River Branch
|
| WRTT | Wrightsville & Tennille
|
| WTTX | WTTX
|
| WYOMING | Wyoming
|
