| 1 | MHM | Mount Hope Mineral R.R.Co. | 1/1975 | | NAKINA |
| 2 | MHM | Consolidated Rail Corp. | 1/1980 | | NAKINA |
| 3 | MHM | Mount Hope Mineral R.R.Co. | Jan-75 | | NRHS |
| 4 | MHM | Consolidated Rail Corp. | Jan-80 | | NRHS |
| 5 | MHM | *MT. HOPE MINERAL RAILROAD CO. | | | PWRC |
| 6 | MHM | *CONRAIL | | | PWRC |
| 7 | MHM | Mt. Hope Mineral Railroad (Norfolk Southern) | | | RSRV |
| 8 | MHMA | MORRIS, THOMAS A | | | SCAC4 |
| 9 | MHMB | MIHM BROTHERS INC | | | SCAC4 |
| 10 | MHMC | MITCHEM TRUCKING LLC | | | SCAC4 |
| 11 | MHMD | MINES, THOMAS D | | | SCAC4 |
| 12 | MHME | MARSHA | | | SCAC4 |
| 13 | MHMF | MUNCKHOF MANUFACTURING | | | SCAC4 |
| 14 | MHMH | MURRAY, HANK AND MARY | | | SCAC4 |
| 15 | MHMI | MACCOSHA | | | SCAC4 |
| 16 | MHMJ | MITUSA H & M INC | | | SCAC4 |
| 17 | MHML | MALUEG, M H TRUCKING CO LLC | | | SCAC4 |
| 18 | MHMM | M H MOVING AND STORAGE INC | | | SCAC4 |
| 19 | MHMN | METALTECH-OME | | | SCAC4 |
| 20 | MHMR | METHODS & MATERIALS INC | | | SCAC4 |
| 21 | MHMS | MONARCH MESSENGER SERVICES LTD | | | SCAC4 |
| 22 | MHMT | MOHIMA TRANSPORT | | | SCAC4 |
| 23 | MHMU | MICHAEL HUBER MUNCHEN GMBH | | | SCAC4 |
| 24 | MHMX | Miner-Hillard Milling Co. | added 10/1963; 7/1965-10/1966; eliminated 4/1967 | | NAKINA |
| 25 | MHMX | Miner-Hillard Milling Co. | 7/65-10/66; eliminated 4/67 | | NRHS |
| 26 | MHMX | MINER-HILLARD MILLING CO. | | | PWRC |
