Gold Coast Government Railways class 221
Ghana 1924 24 produced
The class 221 was a successful design of Mountain locomotive that was built by Vulcan Foundry over a long period of 24 years. It had a long and sleek boiler with Belpaire firebox, combustion chamber and Robinson superheater. The drivers measured only three feet and nine inches or 1,143 mm. With cylinders of 19.25 by 24 inches, this led to a tractive effort of more than 30,000 pounds or 138 kN. The first four were completed in 1924, followed by five more in 1938. The last and largest batch of 15 was delivered in 1948.
Technical data
General
- Built
- 1924, 1938, 1948
- Manufacturers
- Vulcan Foundry
- Wheel arrangement
- 4-8-2 (Mountain)
- Gauge
- 1,067 mm (Cape gauge)
Dimensions and weights
- Wheelbase
- 9.37 m
- Total wheelbase
- 16.97 m
- Service mass
- 74.8 t
- Adhesion mass
- 52.8 t
- Total mass
- 108.1 t
- Rigid wheelbase
- 3.89 m
- Water capacity
- 11,364 l
- Fuel capacity
- 6.6 t (coal)
Boiler
- Grate area
- 2.986 m²
- Firebox surface
- 18.395 m²
- Tube heating surface
- 164.903 m²
- Evaporative heating surface
- 183.298 m²
- Superheater surface
- 32.237 m²
- Total heating surface
- 215.5 m²
Power plant
- Driver diameter
- 1,143 mm
- Boiler pressure
- 12.4 bar
- Expansion type
- simple expansion
- Cylinders
- two, 495 x 610 mm
Power
- Power source
- steam
- Estimated power
- 1,044 kW (1,419 PS)
- Starting effort
- 138.0 kN
Calculated values
- Factor of adhesion
- 1 : 3.76
- Optimal speed
- 47 km/h
- Power-to-weight ratio
- 14.0 kW/t
- Heating Surface Equivalent
- 339.7 m²
- Cylinder volume/HSE
- 1 : 691.43
- Adhesive weight/Total
- 1 : 1.42
- Tractive force/Heating surface
- 1 : 13.37
- Grate area/Heating surface
- 1 : 72.18
- Firebox/Tube surface
- 1 : 8.96
- Total/Superheater
- 1 : 5.69
