| South Australian Railways M class (second) | 
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| | Type and origin | 
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 | Power type | Steam | 
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 | Builder | Phoenix Foundry - Ballarat, Victoria David Munro & Co. - Melbourne, Victoria
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 | Build date | 1889-1894 | 
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 | Total produced | 20 | 
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| | Specifications | 
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 | Configuration: 
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 | • Whyte | 2-4-2T(1′B1′ T) | 
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 | Gauge | 1,600 mm (5 ft 3 in) | 
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 | Driver dia. | 5 ft 0 in (1,524 mm) | 
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 | Length | 33 ft 8 in (10.26 m) | 
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 | Height | 12 ft 9+1⁄2 in (3,898.9 mm) | 
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 | Axle load | 16 long tons 8 cwt (36,700 lb or 16.7 t) | 
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 | Total weight | 53 long tons 8 cwt (119,600 lb or 54.3 t) | 
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 | Fuel type | Coal | 
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 | Fuel capacity | 2 long tons 10 cwt (5,600 lb or 2.5 t) | 
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 | Water cap. | 1,600 imp gal (1,900 US gal; 7,300 L)
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 | Firebox: |  | 
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 | • Grate area | 17.8 sq ft (1.65 m2) | 
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 | Boiler pressure | 140 psi (965 kPa) | 
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 | Heating surface: |  | 
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 | • Firebox | 83.4 sq ft (7.75 m2) | 
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 | • Tubes | 988.7 sq ft (91.85 m2) | 
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 | Cylinders | 2 | 
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 | Cylinder size | 17.5 in × 26 in (444 mm × 660 mm)
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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.
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| Steam locomotives – 1,600 mm (5 ft 3 in) gauge |  | 
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| Steam locomotives – 1,067 mm (3 ft 6 in) gauge |  | 
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| Diesel locomotives |  | 
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| Railcars |  | 
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| Electric multiple units |  | 
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| Passenger carriages by class |  | 
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| Named or significant trains |  | 
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