Great Indian Peninsula class D/4
India 1912 6 produced
The class D/4 of the Great Indian Peninsula Railway was a 4-6-0 locomotive for passenger and mail service with a driver diameter of 74 inches. Essentially, it was a superheated version of the BESA HP standard design. Compared to this, the boiler pressure had been reduced by 20 psi and the cylinder diameter was increased from 19 to 20.5 inches. To make space for the superheater, roughly half of the tubes were removed in favour of flues. Only six locomotives of this class were built and also used for very long distance mail trains. One of these ran from Calcutta to Howrah and ran 1,349 miles (2,170 km) in 44 1/4 hours.
Technical data
General
- Built
- 1912
- Manufacturers
- Vulcan Foundry
- Wheel arrangement
- 4-6-0 (Ten-wheeler)
- Gauge
- 1,676 mm (Indian broad gauge)
Dimensions and weights
- Wheelbase
- 8.31 m
- Total wheelbase
- 15.75 m
- Service mass
- 72.1 t
- Adhesion mass
- 52.3 t
- Total mass
- 119.4 t
- Rigid wheelbase
- 4.34 m
- Axle load
- 17.5 t
- Water capacity
- 18,185 l
- Fuel capacity
- 8.1 t (coal)
Boiler
- Grate area
- 2.973 m²
- Firebox surface
- 14.121 m²
- Tube heating surface
- 134.431 m²
- Evaporative heating surface
- 148.552 m²
- Superheater surface
- 37.812 m²
- Total heating surface
- 186.4 m²
Power plant
- Driver diameter
- 1,880 mm
- Boiler pressure
- 11 bar
- Expansion type
- simple expansion
- Cylinders
- two, 521 x 660 mm
Power
- Power source
- steam
- Estimated power
- 858 kW (1,167 PS)
- Starting effort
- 89.3 kN
Calculated values
- Factor of adhesion
- 1 : 5.75
- Optimal speed
- 60 km/h
- Power-to-weight ratio
- 11.9 kW/t
- Heating Surface Equivalent
- 294.8 m²
- Cylinder volume/HSE
- 1 : 954.12
- Adhesive weight/Total
- 1 : 1.38
- Tractive force/Heating surface
- 1 : 10.01
- Grate area/Heating surface
- 1 : 62.69
- Firebox/Tube surface
- 1 : 9.52
- Total/Superheater
- 1 : 3.93
