| 1 | W&DB | Wildwood and Delaware Bay Short Line R.R. Co. | 7/1923-7/1932 | NAKINA | |
| 2 | W&DB | WILDWOOD & DELAWARE BAY SHORT LINE RAILROAD CO. | PWRC | ||
| 3 | W&LE | The Wheeling & Lake Erie Ry. Co. | 8/1920-7/1936 | NAKINA | |
| 4 | W&LE | WHEELING & LAKE ERIE RWY. CO. | PWRC | ||
| 5 | W&N | Wisconsin & Northern R.R. Co. | 8/1920 | NAKINA | |
| 6 | W&N | Wisconsin & Northern R.R. Co. (Minneapolis, St. Paul & Saulte Ste. Marie Ry.) | 7/1923 | NAKINA | |
| 7 | W&N | MINNEAPOLIS, ST. PAUL & SAULTE STE. MARIE RWY. [WISCONSIN & NORTHERN RAILROAD CO.] | PWRC | ||
| 8 | W&NB | Williamsport & North Branch R.R. Co. | 8/1920 | NAKINA | |
| 9 | W&NB | Williamsport & North Branch Ry. Co. | 7/1930-4/1938 | NAKINA | |
| 10 | W&NB | Williamsport & North Branch Ry. Co. | Apr-38 | NRHS | |
| 11 | W&NB | WILLIAMSPORT & NORTH BRANCH RWY. CO. | PWRC | ||
| 12 | W&NO | Wharton & Northern R.R. (Co.) | 7/1923-4/1970 | NAKINA | |
| 13 | W&NO | Wharton & Northern R.R. | 4/38-4/70 | NRHS | |
| 14 | W&NO | WHARTON & NORTHERN RAILROAD CO. | PWRC | ||
| 15 | W&NR | Williamsport & North Branch Ry. Co. | 7/1923 | NAKINA | |
| 16 | W&NR | WILLIAMSPORT & NORTH BRANCH RWY. CO. | PWRC | ||
| 17 | W&OV | Warren & Ouachita Valley Ry. | 7/1923-4/1970 | NAKINA | |
| 18 | W&OV | Warren & Ouachita Valley Ry. | 4/38-4/70 | NRHS | |
| 19 | W&OV | WARREN & OUACHITA VALLEY RWY. CO. | PWRC | ||
| 20 | W&TR | Wrightsville and Tennille R.R. Co. | 7/1930-7/1936 | NAKINA | |
| 21 | W&TR | WEST TEXAS AND LUBBOCK RAILROAD CO. | PWRC | ||
| 22 | WA | The Western Ry. of Alabama | 1/1975-1/1980; eliminated 1/1983 | NAKINA | |
| 23 | WA | Seaboard System R.R., Inc. | added 1/1983; eliminated 7/1987 | NAKINA | |
| 24 | WA | CSX Transportation, Inc. | added 7/1987; 1/1994-7/2005 | NAKINA | |
| 25 | WA | The Western Ry. of Alabama | 1/75-1/80; eliminated 1/83 | NRHS | |
| 26 | WA | Seaboard System R.R., Inc. | added 1/83; eliminated 7/87 | NRHS | |
| 27 | WA | CSX Transportation, Inc. | added 7/87; 1/94-7/2000 | NRHS | |
| 28 | WA | CSX TRANSPORTATION, INC. [(SEABOARD) WESTERN RAILWAY OF ALABAMA] | PWRC | ||
| 29 | WA | Western Railway of Alabama (CSX Transportation) | RSRV | ||
| 30 | WA | The Western Railway of Alabama | USA | TRAFFIC | |
| 31 | WAA | Westair Aviation | ICAO1 | ||
| 32 | WAAL | WALTH, ALLEN | SCAC4 | ||
| 33 | WAAR | WALTERS, J ENT LTD | SCAC4 | ||
| 34 | WAB | Aero Industries Inc | ICAO1 | ||
| 35 | WAB | Wabash R.R. | 10/1957-7/1965 | NAKINA | |
| 36 | WAB | Wabash R.R. Co. (Norfolk and Western Ry. Co.) | 10/1966-4/1970 | NAKINA | |
| 37 | WAB | Norfolk and Western Ry. Co. | 1/1975-1/1980; eliminated 1/1991 | NAKINA | |
| 38 | WAB | Norfolk Southern Ry. Co. | added 1/1991; 1/1994-7/2000 | NAKINA | |
| 39 | WAB | Norfolk Southern Ry. Co. (Norfolk Southern) | 7/2005 | NAKINA | |
| 40 | WAB | Wabash R.R. | 10/57-7/65 | NRHS | |
| 41 | WAB | Wabash R.R. Co. (Norfolk and Western Ry. Co.) | 10/66-4/70 | NRHS | |
| 42 | WAB | Norfolk and Western Ry. Co. | 1/75-1/80; eliminated 1/91 | NRHS | |
| 43 | WAB | Norfolk Southern Ry. Co. | added 1/91; 1/94-7/2000 | NRHS | |
| 44 | WAB | Westfälische Almetalbahn GmbH | Altenbeken | D | privat-bahn.de |
| 45 | WAB | NORFOLK SOUTHERN RAILWAY COMPANY [NORFOLK & WESTERN RWY.; WABASH RR] | PWRC | ||
| 46 | WAB | Wabash Railroad (Norfolk Southern) | RSRV | ||
| 47 | WAB | Wengernalpbahn | CH | TRAFFIC | |
| 48 | WAB | Westfälische Almetalbahn | DE | VKM | |
| 49 | WABA | Waldbahn Almetal e.V. | DE | VKM | |
| 50 | WABB | WALTERS INC | SCAC4 | ||
| 51 | WABC | ABC LINES | PWRC | ||
| 52 | WABC | W S TRANSPORTATION | SCAC4 | ||
| 53 | WABD | Westfälische Almetalbahn | Real: WAB | D | TRAFFIC |
| 54 | WABF | WALGATE, WENDY | SCAC4 | ||
| 55 | WABI | WARWICK ORCHARDS & NURSERY LTD | SCAC4 | ||
| 56 | WABM | WABASH MFG INC | SCAC4 | ||
| 57 | WABN | WALBON AND COMPANY INC | SCAC4 | ||
| 58 | WABP | WADE, GARY TRUCKING | SCAC4 | ||
| 59 | WABR | Wabash Railroad | Real: WAB | USA | TRAFFIC |
| 60 | WABS | WARDANE ENTERPRISES INC | SCAC4 | ||
| 61 | WABT | WALNUT HILL TRANSPORT | SCAC4 | ||
| 62 | WABU | HOYER GMBH | SCAC4 | ||
| 63 | WABX | Westinghouse Air Brake Co. | 7/1923 | NAKINA | |
| 64 | WABX | WESTINGHOUSE AIR BRAKE CO. (WABCO) | PWRC | ||
| 65 | WABZ | WTL RAIL CORPORATION | PWRC | ||
| 66 | WABZ | WTL Rail Corporation | RSRV | ||
| 67 | WABZ | WTL RAIL CORPORATION | SCAC4 | ||
| 68 | WAC | West African Cargo Airlines | ICAO1 | ||
| 69 | WACD | WATER SPIRIT FREIGHT | SCAC4 | ||
| 70 | WACF | WALDHEIM COLONY FARMS LTD | SCAC4 | ||
| 71 | WACG | WEST ATLANTIC CARGO LEASING & SERVI | SCAC4 | ||
| 72 | WACH | WASHINGTON CARRIERS INC | SCAC4 | ||
| 73 | WACK | WACEK INC | SCAC4 | ||
| 74 | WACL | WESTCHEM AGRICULTURAL CHEMICALS INC | SCAC4 | ||
| 75 | WACN | WALKER CRANE & RIGGING CORP | SCAC4 | ||
| 76 | WACO | WHITE, A C TRANSFER & | SCAC4 | ||
| 77 | WACQ | WANDERING FIRE POTTERY & TILE WORKS | SCAC4 | ||
| 78 | WACR | Washington County R.R. Corp. | added 4/1981; 1/1994; eliminated 7/1997; 7/2000-7/2005 | NAKINA | |
| 79 | WACR | Washington County R.R. Corp. | added 4/81; 1/94; eliminated 7/97; 7/2000 | NRHS | |
| 80 | WACR | WASHINGTON COUNTY RAILROAD CORPORATION | PWRC | ||
| 81 | WACR | Washington County Railroad | RSRV | ||
| 82 | WACT | WACONIA TRANSPORT COMPANY INC | SCAC4 | ||
| 83 | WACV | WHITE, A C MOVING SYSTEMS INC | SCAC4 | ||
| 84 | WACW | WANDERING ANGUS CELTIC TRADERS | SCAC4 | ||
| 85 | WACX | Albright & Wilson Co. | added 4/1990; 1/1994-7/2000; eliminated 10/2003 | NAKINA | |
| 86 | WACX | PCS Phosphate Co. | added 10/2003; 7/2005 | NAKINA | |
| 87 | WACX | Albright & Wilson Company | added 4/90; 1/94-7/2000 | NRHS | |
| 88 | WACX | *WILLARD AGRICULTURAL COMPANY | PWRC | ||
| 89 | WACX | +PCS PHOSPHATE COMPANY INCORPORATED [ALBRIGHT & WILSON COMPANY] | PWRC | ||
| 90 | WACX | Willard Agricultural Co. (PCS Phosphate) | RSRV | ||
| 91 | WACX | PCS PHOSPHATE COMPANY INC | SCAC4 | ||
| 92 | WAD | Waddington FTU | ICAO1 | ||
| 93 | WADC | WHEELS ASSURED DELIVERY SYSTEMS INC | SCAC4 | ||
| 94 | WADE | WADE ENVIRONMENTAL | SCAC4 | ||
| 95 | WADE | Wade Tours | USA | TRAFFIC | |
| 96 | WADF | WAYNES CUSTOM WOODCRAFT LTD | SCAC4 | ||
| 97 | WADG | WADE TRUCKING INC | SCAC4 | ||
| 98 | WADK | WOLLMANN, ALBERT | SCAC4 | ||
| 99 | WADR | WADDELL TRANSPORT LIMITED | SCAC4 | ||
| 100 | WADS | WADSWORTH&REILLY EXPRESS, INC | SCAC1 |