| Start date | Abbr. | Full name | Closing date | Then called | Remarks |
|---|
| 20 August 1906 | MC | Martigny-Châtelard | | | |
| 1 February 1908 | MCM | Monthey-Champéry-Morgins | 1 January 1946 | AOMC | |
| 5 June 1890 | MG | Monte Generoso | | | |
| 8 April 1909 | MGl | Montreux-Glion | 1 January 1987 | MGN | |
| 1 January 1987 | MGN | Montreux-Glion-Rochers-de-Naye | 1 January 1992 | MTGN | |
| 6 May 1946 | MIB | Meiringen-Innertkirchen-Bahn | | | |
| 9 August 1907 | MMB | Muottas-Muragl-Bahn | | | |
| 1 September 1910 | MO | Martigny-Orsières | | | |
| 18 December 1901 | MOB | Montreux-Oberland bernois | | | |
| | MPF | Mol�son-Village-Plan-Francey | | | Under construction |
| 24 August 1912 | MRA | Meiringen-Reichenbach-Aareschlucht | 16 September 1956 | | Abandoned |
| 27 March 1890 | MS | Lugano-Monte S.Salvatore | | | |
| 26 August 1968 | MSG | Mühleggbahn St.Gallen | | | |
| 1 January 1992 | MTGN | Montreux-Territet-Glion-Rochers-de-Naye | | | |
| 20 December 1911 | MThB | Mittelthurgau-Bahn | | | |
