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Tasmanian Government classes M and MA
The second class of locomotives of the Tasmanian Government Railways which carried the letter M was a Pacific introduced in 1951. This letter had previously been used by a Garratt, the last of which had been withdrawn...
General
| Property | Tasmanian Government classes M and MA M |
|---|---|
| Built | 1951 |
| Manufacturers | Robert Stephenson & Hawthorns |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,067 mm (Cape gauge) |
Dimensions and weights
| Property | Tasmanian Government classes M and MA M |
|---|---|
| Length | 18.05 m |
| Wheelbase | 8.51 m |
| Rigid wheelbase | 3.20 m |
| Total wheelbase | 15.71 m |
| Service weight | 55 t |
| Adhesive weight | 30.7 t |
| Axle load | 10.4 t |
| Total weight | 98.1 t |
| Water capacity | 18,185 l |
| Fuel capacity | 6.1 t (coal) |
Boiler
| Property | Tasmanian Government classes M and MA M |
|---|---|
| Grate area | 2.146 m² |
| Firebox surface | 12.681 m² |
| Tube heating surface | 90.348 m² |
| Evaporative heating surface | 103.03 m² |
| Superheater surface | 24.619 m² |
| Total heating surface | 127.6 m² |
Power plant
| Property | Tasmanian Government classes M and MA M |
|---|---|
| Driver diameter | 1,397 mm |
| Boiler pressure | 12.4 bar |
| Expansion type | simple expansion |
| Cylinders | two, 406 x 610 mm |
Power
| Property | Tasmanian Government classes M and MA M |
|---|---|
| Power source | steam |
| Estimated power | 690 kW (938 PS) |
| Starting effort | 76.0 kN |
Calculated values
| Property | Tasmanian Government classes M and MA M |
|---|---|
| Factor of adhesion | 1 : 3.96 |
| Optimal speed | 56 km/h |
| Power-to-weight ratio | 12.5 kW/t |
| Heating Surface Equivalent | 215.7 m² |
| Cylinder volume/HSE | 1 : 733.29 |
| Adhesive weight/Total | 1 : 1.79 |
| Tractive force/Heating surface | 1 : 12.44 |
| Grate area/Heating surface | 1 : 59.48 |
| Firebox/Tube surface | 1 : 7.12 |
| Total/Superheater | 1 : 4.18 |
