| 1 | MTW | Mauritania Airways | Callsign: Mauritania Airways, | RIM | AVCODES |
| 2 | MTW | Tomahawk Ry., Limited Partnership | added 4/1992; 1/1994 (not listed) | | NAKINA |
| 3 | MTW | Marinette, Tomahawk & Western R.R. Co. | 1/1975-1/1980; eliminated 4/1992 | | NAKINA |
| 4 | MTW | Marinette, Tomahawk & Western R.R. Co. | 1/75-1/80; eliminated 4/92 | | NRHS |
| 5 | MTW | Tomahawk Ry., Limited Partnership | added 4/92; 1/94 | | NRHS |
| 6 | MTW | TOMAHAWK RAILWAY [MARINETTE, TOMAHAWK & WESTERN RAILROAD COMPANY] | | | PWRC |
| 7 | MTW | Marinette, Tomahawk and Western Railroad | | | RSRV |
| 8 | MTW | Marinette, Tomahawk and Western Railroad | | USA | TRAFFIC |
| 9 | MTW | MTW Rail AB | | SE | VKM |
| 10 | MTWC | MANGAN TEAM FARMS LIMITED | | | SCAC4 |
| 11 | MTWC | Montreal Tramways Company | | CDN | TRAFFIC |
| 12 | MTWE | MUNDIES TOWING & RECOVERY | | | SCAC4 |
| 13 | MTWG | MITCHENER TRANSPORT | | | SCAC4 |
| 14 | MTWI | MAIERS TRANSPORT & WAREHOUSING INC | | | SCAC4 |
| 15 | MTWM | MCI TRUCKING INC | | | SCAC4 |
| 16 | MTWN | MILLTOWN TRUCKING CO LTD | | | SCAC4 |
| 17 | MTWQ | M TWO (M2) TRANSPORT INC | | | SCAC4 |
| 18 | MTWT | MOUNTAIN WEST MOVING & STORAGE | | | SCAC4 |
| 19 | MTWV | METEOR TOWING INC | | | SCAC4 |
