| 1 | MTM | MTM Aviation GmbH | Callsign: Avitrans, | D | AVCODES |
| 2 | MTM | MEMPHIS TRANSPORTATION MUSEUM | | | PWRC |
| 3 | MTM | Museumstramway Mariazell | | A | TRAFFIC |
| 4 | MTMA | MT MARITIME MANAGEMENT (USA) LLC | | | SCAC4 |
| 5 | MTMB | M TWO (2) M | | | SCAC4 |
| 6 | MTMD | MID THUMB MATERIALS INC | | | SCAC4 |
| 7 | MTMI | Metro Transit (Minnesota) | City: Minneapolis, Saint Paul | USA | TRAFFIC |
| 8 | MTMJ | MILITARY TRANSPORTATION MOVERS CORP | | | SCAC4 |
| 9 | MTMR | MOTORAMA AUTO CENTER INC | | | SCAC4 |
| 10 | MTMS | METRO MOVING AND STORAGE | | | SCAC4 |
| 11 | MTMU | MTT SHIPPING SDN. BHD. | | MAL | BIC |
| 12 | MTMU | MARCH, LTD | | | PWRC |
| 13 | MTMX | Modern Track Machinery Canada Ltd. (MofW cars) | 1/1994 (not listed) | | NAKINA |
| 14 | MTMX | Modern Track Machinery Canada Ltd. | 1/1980 | | NAKINA |
| 15 | MTMX | Modern Track Machinery Canada Ltd. | Jan-80 | | NRHS |
| 16 | MTMX | Modern Track Machinery Canada Ltd. (MofW cars) | Jan-94 | | NRHS |
| 17 | MTMX | MODERN TRACK MACHINERY CANADA LTD | | | PWRC |
| 18 | MTMX | Modern Track Machinery | | | RSRV |
