Burma Railways class As
Burma 1916 8 produced
The Burma Railways class As was built in 1916 by Beyer, Peacock & Co. for light suburban passenger traffic. These eight tank locomotives had the wheel arrangement 4-6-4T and a slender boiler. The Belpaire firebox was located between the second and third driving axle, but was concealed by the water tanks which went forward up to the smokebox. No. 144 is now on display at the main station in the former Capital Yangon. It now carries the letters “MR” instead of “BR”, since the country has been renamed to Myanmar.
Technical data
General
- Built
- 1916
- Manufacturers
- Beyer, Peacock & Co.
- Wheel arrangement
- 4-6-4T (Hudson)
- Gauge
- 1,000 mm (Meter gauge)
Dimensions and weights
- Wheelbase
- 9.20 m
- Service mass
- 61.4 t
- Adhesion mass
- 30.2 t
- Rigid wheelbase
- 3.66 m
- Axle load
- 10.1 t
- Water capacity
- 5,001 l
- Fuel capacity
- 3 t (coal)
Boiler
- Grate area
- 1.431 m²
- Firebox surface
- 9.29 m²
- Tube heating surface
- 63.36 m²
- Evaporative heating surface
- 72.65 m²
- Superheater surface
- 14.493 m²
- Total heating surface
- 87.1 m²
Power plant
- Driver diameter
- 1,219 mm
- Boiler pressure
- 12.8 bar
- Expansion type
- simple expansion
- Cylinders
- two, 381 x 559 mm
Power
- Power source
- steam
- Estimated power
- 522 kW (710 PS)
- Starting effort
- 72.1 kN
Calculated values
- Factor of adhesion
- 1 : 4.10
- Optimal speed
- 45 km/h
- Power-to-weight ratio
- 8.5 kW/t
- Heating Surface Equivalent
- 148.1 m²
- Cylinder volume/HSE
- 1 : 860.42
- Adhesive weight/Total
- 1 : 2.03
- Tractive force/Heating surface
- 1 : 17.29
- Grate area/Heating surface
- 1 : 60.90
- Firebox/Tube surface
- 1 : 6.82
- Total/Superheater
- 1 : 5.01
