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Tasmanian Government class M
The good experiences with the first narrow-gauge Garratts led the Tasmanian Government Railways to order two Cape gauge Garratts each for passenger and freight trains in 1912. Two class M Double Atlantics were ordered...
| Tasmanian Government class MRemove | |
|---|---|
| Variant | Standard |
| Built | 1912 |
| Manufacturers | Beyer, Peacock & Co. |
| Wheel arrangement | (2B1)(1B2) t ga |
| Gauge | 1067 mm |
| Length | |
| Service mass | 96067 kg |
| Top speed | 97 km/h |
| Power | |
| Engine |
General
| Property | Tasmanian Government class M Standard Remove |
|---|---|
| Built | 1912 |
| Manufacturers | Beyer, Peacock & Co. |
| Wheel arrangement | 4-4-2+2-4-4 (Double Atlantic (Garratt)) |
| Gauge | 1,067 mm |
Dimensions and weights
| Property | Tasmanian Government class M Standard Remove |
|---|---|
| Wheelbase | 6.33 m |
| Total wheelbase | 18.85 m |
| Service mass | 96.1 t |
| Adhesion mass | 48.8 t |
| Rigid wheelbase | 1.83 m |
| Axle load | 15.8 t |
| Water capacity | 13,639 l |
| Fuel capacity | 4.1 t (coal) |
Boiler
| Property | Tasmanian Government class M Standard Remove |
|---|---|
| Grate area | 3.149 m² |
| Firebox surface | 14.446 m² |
| Tube heating surface | 142.188 m² |
| Evaporative heating surface | 156.635 m² |
| Superheater surface | 30.937 m² |
| Total heating surface | 187.6 m² |
Power plant
| Property | Tasmanian Government class M Standard Remove |
|---|---|
| Driver diameter | 1,524 mm |
| Boiler pressure | 11 bar |
| Expansion type | simple expansion |
| Cylinders | eight, 305 x 508 mm |
Power
| Property | Tasmanian Government class M Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 895 kW (1,217 PS) |
| Top speed | 97 km/h |
| Starting effort | 116.2 kN |
Calculated values
| Property | Tasmanian Government class M Standard Remove |
|---|---|
| Factor of adhesion | 1 : 4.12 |
| Optimal speed | 47 km/h |
| Power-to-weight ratio | 9.3 kW/t |
| Heating Surface Equivalent | 290.7 m² |
| Cylinder volume/HSE | 1 : 1,019.93 |
| Adhesive weight/Total | 1 : 1.97 |
| Tractive force/Heating surface | 1 : 12.93 |
| Grate area/Heating surface | 1 : 59.57 |
| Firebox/Tube surface | 1 : 9.84 |
| Total/Superheater | 1 : 5.06 |
