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The reference for locomotives and railcars

Jamaican Government Railway No. 21 and 22

Jamaica 1894 2 produced
Locomotive Magazine, September 1919

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
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