Jamaican Government Railway No. 21 and 22
Jamaica 1894 2 produced
In 1894, Rhode Island built two 2-6-4T passenger tank locomotives for the Jamaican Government Railway. They were a follow-up of No. 18 that had the wheel arrangement 2-4-4T. While No. 18 had two cylinders with simple expansion, 21 and 22 were two-cylinder compounds with the low pressure cylinder on the left side. Otherwise the new locomotives were similar, with round-topped boilers and tank and bunker at the rear. The long frames had stability issues, especially with heavy supplies on one end. So No. 22 suffered frame cracks twice, in 1899 and 1905. It was scrapped in 1907 and 21 followed in 1908.
Technical data
General
- Built
- 1894
- Manufacturers
- Rhode Island
- Wheel arrangement
- 2-6-4T
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Wheelbase
- 9.14 m
- Adhesion mass
- 37.6 t
- Total mass
- 58.7 t
- Rigid wheelbase
- 3.96 m
- Water capacity
- 8,956 l
- Fuel capacity
- 2.7 t (coal)
Boiler
- Grate area
- 1.635 m²
- Firebox surface
- 9.848 m²
- Tube heating surface
- 77.853 m²
- Evaporative heating surface
- 87.701 m²
- Total heating surface
- 87.7 m²
Power plant
- Driver diameter
- 1,270 mm
- Boiler pressure
- 12.4 bar
- Cylinders
- two, HP: 457 x 610 mm and LP: 711 x 610 mm
Power
- Estimated power
- 298 kW (405 PS)
Calculated values
- Optimal speed
- 24 km/h
- Power-to-weight ratio
- 5.1 kW/t
- Heating Surface Equivalent
- 136.9 m²
- Cylinder volume/HSE
- 1 : 1,615.03
- Grate area/Heating surface
- 1 : 53.64
- Firebox/Tube surface
- 1 : 7.91