| Abbreviation | Definition |
|---|---|
| WAR | Warrenton Railroad Company |
| WAS | Waynesburg Southern |
| WATC | Washington Terminal |
| WATC | Washington Terminal Company |
| WATR | Water Carriers |
| WATR | Waterville Railroad |
| WATZ | Western Auto |
| WAW | Waynesburg & Washington Railroad (Conrail) |
| WAW | Waynesburg And Washington Railroad |
| WBC | Wilkes-Barre Connecting Railroad |
| WBCR | Wabash Central Railroad Corporation |
| WBCX | Blue Circle Incorporated |
| WBCX | Williams Brothers Concrete |
| WBJ | Whistle Ban Jurisdiction |
| WBMX | Lauhoff Grain Company |
| WBMX | Wilkes-Barre Milling (Lauhoff Grain) |
| WBPU | Seacube Container Leasing |
| WBTS | Waco Beaumont Trinity and Sabine Railway Company |
| WBTS | Waco, Beaumont, Trinity and Sabine Railway |
| WC | Wisconsin Central Limited |