Indian Railways class YG
The class YG was a metre-gauge 2-8-2 goods locomotive that was part of the Indian Railway Standard (IRS) program. It was like a downscaled broad-gauge WG, but also shared many parts and its general appearance with the metre-gauge YP Pacific. Being the successor to the YD Mikado, it could deliver the same power despite a smaller boiler due to the use of the latest advancements in technology.
Between 1949 and 1972, a total of 1,074 were built by manufacturers from Austria, Canada, India, Czechoslovakia, Japan and the USA. The last YG built was at the same time the last metre-gauge steam locomotive built in India. Its wheel diameter of 48 inches (1,219 mm) also allowed it to be used for passenger trains.
In 1976, five locomotives which were only five years old were exported to Tanzania. They had been overhauled and modified for use in another country and became EAR class 27II. Many YG were still in use in India in the nineties, with the last ones being withdrawn in 1999. Today at least 50 are being preserved, some have also been sold to the USA.
Technical data
General
- Built
- 1949-1972
- Manufacturers
- Baldwin, Canadian Locomotive Co., Chittaranjan, Škoda, Mitsubishi, Montreal, Nippon Sharyō, Tata, Floridsdorf
- Wheel arrangement
- 2-8-2 (Mikado)
- Gauge
- 1,000 mm (Meter gauge)
Dimensions and weights
- Service mass
- 58.9 t
- Adhesion mass
- 42.7 t
Boiler
- Grate area
- 2.601 m²
- Firebox surface
- 13.935 m²
- Evaporative heating surface
- 103.215 m²
- Total heating surface
- 103.2 m²
Power plant
- Driver diameter
- 1,219 mm
- Boiler pressure
- 14.5 bar
- Expansion type
- simple expansion
- Cylinders
- two, 413 x 610 mm
Power
- Power source
- steam
- Estimated power
- 746 kW (1,014 PS)
- Top speed
- 64 km/h
- Starting effort
- 104.8 kN
Calculated values
- Factor of adhesion
- 1 : 3.99
- Optimal speed
- 43 km/h
- Power-to-weight ratio
- 12.7 kW/t
- Adhesive weight/Total
- 1 : 1.38
- Tractive force/Heating surface
- 1 : 21.21
- Grate area/Heating surface
- 1 : 39.68
