| Railroad | Records | Links |
|---|
| Totals | 33,505 | 1,022 |
|---|
| Wabash Chester and Western Railroad | 5 | |
| Wabash Railroad | 101 | 5 |
| Wabash, Chester and Western Railroad | 8 | |
| Wabash, St Louis and Pacific Railway | 54 | 6 |
| Wallkill Valley Railroad | 6 | |
| Warren and Corsicana Pacinc Railway | 4 | |
| Warrenton Railroad | 4 | |
| Warsaw and Rockford Railroad | 15 | |
| Washington and Georgetown Railroad | | 2 |
| Washington and Ohio Railroad | | 1 |
| Washington and Old Dominion Railroad | | 1 |
| Washington and Plymouth Railroad | 4 | |
| Washington County Central Railroad | 14 | |
| Washington County Railroad | 6 | |
| Washington Run Railroad | 7 | |
| Washington Southern Railway | 5 | |
| Washington, Alexandria and Georgetown Railroad | 6 | |
| Washington, Potomac and Chesapeake Railroad | 4 | |
| Watertown and Rome Railroad | 26 | |
| Waukegan and Mississippi Valley Railway | 2 | |
| Waynesburgh and Washington Railroad | 5 | 1 |
| Weatherford, Mineral Wells and Northwestern Railway | 4 | |
| Wellington and Powellsville Railroad | 6 | 1 |
| Wellsville Coudersport and Pine Creek Railroad | 5 | |
| West Chester and Philadelphia Railroad | 15 | |
| West Chester Railroad | 14 | 1 |
| West Chester, Media and Philadelphia Railroad | 11 | |
| West Feliciana Railroad | | 1 |
| West Jersey and Seashore Railroad | 9 | 2 |
| West Jersey Railroad | 11 | 1 |
| West Shore Railroad | 22 | 3 |
| West Side Belt Railroad | 6 | |
| West Virginia and Southern Railroad | 8 | |
| West Virginia Central and Pittsburgh Railway | 19 | 2 |
| West Virginia Northern Railroad | 4 | |
| West Wisconsin Railway | 11 | 1 |
| Western and Atlantic Railroad | 29 | 1 |
| Western Maryland Railroad | 37 | 3 |
| Western Maryland Railway | 3 | |
| Western New York and Pennsylvania Railroad | 13 | |
| Western North Carolina Railroad | 6 | 1 |
| Western Railroad of Massachusetts | 20 | 1 |
| Western Railway of Alabama | 18 | 1 |
| Western Union Railroad | 29 | |
| Western Vermont Railroad | 20 | |
| Weston and Atchison Railroad | 15 | |
| Wheeling and Lake Erie Railroad | 40 | 4 |
| Wheeling Terminal Railway | 7 | 1 |
| Whippany River Railroad | 4 | |
| White Castle and Lake Natchez Railway | 1 | |
| White River Valley Railroad | 2 | |
| Wichita Valley Railway | 8 | |
| Williams Valley Railroad | 5 | |
| Williamsport and North Branch Railroad | 15 | |
| Williamsville, Greenville and St Louis Railway | 11 | |
| Wilmington and Manchester Railroad | 31 | 1 |
| Wilmington and Northern Railroad | 11 | 3 |
| Wilmington and Raleigh Railroad | | 1 |
| Wilmington and Reading Railroad | 5 | 1 |
| Wilmington and Susquehanna Railroad | | 1 |
| Wilmington and Weldon Railroad | 52 | 5 |
| Wilmington, Charlotte and Rutherford Railroad | 12 | 1 |
| Wilmington, Columbia and Augusta Railroad | 5 | 1 |
| Winchester and Potomac Railroad | 13 | |
| Winifrede Railroad | 10 | |
| Winnebago Railroad | 15 | |
| Winona and St Peter Railway | 26 | 1 |
| Wiscasaet, Waterville and Farmington Railroad | 4 | |
| Wisconsin and Michigan Railway | 7 | |
| Wisconsin Central Railroad | | 1 |
| Wisconsin Central Railway | 62 | |
| Wisconsin Western Railroad | 7 | |
| Wisconsin, Minnesota and Pacific Railway | 5 | 1 |
| Wood River Branch Railroad | 6 | |
| Worcester and Nashua Railroad | 28 | |
| Wrightsville and Tennille Railroad | 8 | |
| Wyoming and Lehigh Railroad | | 1 |
| Wyoming and Missouri River Railroad | 2 | |
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