Indian Railways class YD
India 1927 270+ produced
The class YD was a metre-gauge goods locomotive developed in accordance with the Indian Railway Standard (IRS) rules. Its direct basis were ten Mikados built in 1927 by the Vulcan Foundry for the Assam Bengal Railway which were later designated YD/1. The boiler was closely related to that of the YC Pacific, but shorter.
Up to 1953, at least 270 were built by manufacturers from Britain, Germany, Czechoslovakia, India and Japan. The 25 locomotives produced in Japan had been built by Nippon Sharyo for Pakistan in 1952 and were oil-fired. Some had also come to Myanmar, of which a few were still in service after 2010. Generally, there are still many which were preserved.
Technical data
General
- Built
- 1927-1953
- Manufacturers
- AEG, Henschel, Nasymyth, Wilson & Co., Nippon Sharyō, SLM, Škoda, Vulcan Foundry, Ajmer
- Wheel arrangement
- 2-8-2 (Mikado)
- Gauge
- 1,000 mm (Meter gauge)
Dimensions and weights
- Length
- 18.31 m
- Wheelbase
- 8.46 m
- Total wheelbase
- 15.37 m
- Empty mass
- 52 t
- Service mass
- 57.5 t
- Adhesion mass
- 40.3 t
- Total mass
- 97.4 t
- Rigid wheelbase
- 4.09 m
- Axle load
- 10.2 t
- Water capacity
- 13,639 l
- Fuel capacity
- 8.1 t (coal)
Boiler
- Grate area
- 2.415 m²
- Firebox surface
- 13.657 m²
- Tube heating surface
- 115.943 m²
- Evaporative heating surface
- 129.6 m²
- Superheater surface
- 28.8 m²
- Total heating surface
- 158.4 m²
Power plant
- Driver diameter
- 1,219 mm
- Boiler pressure
- 12.4 bar
- Expansion type
- simple expansion
- Cylinders
- two, 432 x 610 mm
Power
- Power source
- steam
- Estimated power
- 746 kW (1,014 PS)
- Starting effort
- 98.3 kN
Calculated values
- Factor of adhesion
- 1 : 4.02
- Optimal speed
- 47 km/h
- Power-to-weight ratio
- 13.0 kW/t
- Heating Surface Equivalent
- 255.5 m²
- Cylinder volume/HSE
- 1 : 698.82
- Adhesive weight/Total
- 1 : 1.43
- Tractive force/Heating surface
- 1 : 12.97
- Grate area/Heating surface
- 1 : 65.59
- Firebox/Tube surface
- 1 : 8.49
- Total/Superheater
- 1 : 4.50
