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The reference for locomotives and railcars

Indian Railways class WG

India 1950 2450 produced
Henschel PD

Using the same boiler, valve gear, trailing axle and other assemblies as the WP class Pacific locomotive built from 1947, the WG class Mikado was built from 1950 onwards. In order to be able to produce the quantities required for widespread use in front of freight trains, production was initially divided among several manufacturers in different countries.

The first 100 units came from the North British Locomotive Company in 1950. Later more came from there, others from the Vulcan Foundry, as well as from Belgium, Germany, Italy, Austria, the USA and Japan. Large-scale production only gradually got underway at the Chittaranjan Locomotive Works in India. Since, unlike at North British, they did not yet have the means to manufacture such a large three-shot boiler, the boiler was initially made with four shots. It was not until 1956 that production could be carried out completely in India, so that by 1970 a total of 1,908 of the 2,450 machines in total were built there.

The last WG built was also the last broad gauge steam locomotive built in India. In a nod to the last standard gauge Class 9F steam locomotive “Evening Star” built in Britain, it was called “Antim Sitara”, which has exactly the same meaning. The “Antim Sitara” is one of the nine that still exist today. Another, built in 1964, is still operational today.

Technical data

General

Built
1950-1970
Manufacturers
Chittaranjan, North British, Vulcan Foundry, Anglo-Franco-Belge, Henschel, Ansaldo, Baldwin, Hitachi, Krupp, Floridsdorf
Wheel arrangement
2-8-2 (Mikado)
Gauge
1,676 mm (Indian broad gauge)

Dimensions and weights

Wheelbase
11.05 m
Total wheelbase
20.88 m
Service mass
103.3 t
Adhesion mass
73 t
Total mass
176.2 t
Rigid wheelbase
5.21 m
Axle load
18.8 t
Water capacity
27,051 l
Fuel capacity
9.2 t (coal)

Boiler

Grate area
4.181 m²
Firebox surface
25.548 m²
Tube heating surface
182.276 m²
Evaporative heating surface
207.824 m²
Superheater surface
63.453 m²
Total heating surface
271.3 m²

Power plant

Driver diameter
1,562 mm
Boiler pressure
14.5 bar
Expansion type
simple expansion
Cylinders
two, 559 x 711 mm

Power

Power source
steam
Indicated power
1,940 kW (2,638 PS)
Top speed
80 km/h
Starting effort
175.0 kN

Calculated values

Factor of adhesion
1 : 4.09
Optimal speed
68 km/h
Power-to-weight ratio
18.8 kW/t
Heating Surface Equivalent
462.5 m²
Cylinder volume/HSE
1 : 754.29
Adhesive weight/Total
1 : 1.42
Tractive force/Heating surface
1 : 13.47
Grate area/Heating surface
1 : 64.88
Firebox/Tube surface
1 : 7.13
Total/Superheater
1 : 3.28
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