| South Australian Railways M class (second) | |
| Powertype: | Steam |
| Builder: | Phoenix Foundry - Ballarat, Victoria David Munro & Co. - Melbourne, Victoria |
| Builddate: | 1889-1894 |
| Totalproduction: | 20 |
| Whytetype: | 2-4-2T(1′B1′ T) |
| Driverdiameter: | 5feet |
| Fueltype: | Coal |
| Boilerpressure: | 1400NaN0 |
| Cylindercount: | 2 |
| Cylindersize: | 17.5x |
| Operator: | South Australian Railways Victorian Railways |
| Operatorclass: | M |
| Fleetnumbers: | 256-275 |
| Deliverydate: | 1920 |
| Firstrundate: | 1920 |
| Lastrundate: | 1925-1935 |
| Retiredate: | 1925-1935 |
| Withdrawndate: | 1925-1935 |
| Preservedunits: | 0 |
| Scrapdate: | 1925-1935 |
| Disposition: | All SAR variants scrapped |
The South Australian Railways M class (second) was a group of twenty 2-4-2T engines sold to the SAR by the Victorian Railways for $3,300 each between June 1920 and October 1922. The class was formerly the Victorian Railways' E class.