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The reference for locomotives and railcars

Japanese Government Railways class 8620

Taiwanese State Railway class CT150

Japan 1914 732 produced
collection Mason Allen Buskirk

The class 8620 was the first mass-produced passenger locomotive in Japan. With the wheel arrangement 2-6-0 and the same boiler as the 4-4-0 class 6760, it was mainly intended for regular passenger trains with its higher adhesive weight, but still could haul express trains. A Krauss-Helmholz bogie that connected the leading and the first driving axle reduced the rigid wheelbase to only 2.286 mm.

Between 1914 and 1929, multiple manufacturers produced a total of 672 locomotives for the JGR. The Imperial Taiwan Railway got 43 which were designated class CT150. Additionally, small operators received 17, bringing the total number to 732. From the late twenties, they got smoke deflectors. Most were withdrawn in the fifties, but the Haboro coal railway operated some until 1971. 20 have been preserved in Japan and one in Taiwan.

Preserved 78653 with large smoke deflectors 掬茶

Technical data

General

Built
1914-1929
Manufacturers
Mitsubishi, Hitachi, Nippon Sharyō, Kawasaki, Kisha Seizō
Wheel arrangement
2-6-0 (Mogul)
Gauge
1,067 mm (Cape gauge)

Dimensions and weights

Length
16.77 m
Wheelbase
7.01 m
Total wheelbase
14.31 m
Service mass
46.3 t
Adhesion mass
39.3 t
Total mass
81 t
Rigid wheelbase
2.29 m
Axle load
13.5 t

Boiler

Grate area
1.63 m²
Firebox surface
10.13 m²
Tube heating surface
78.68 m²
Evaporative heating surface
88.81 m²
Superheater surface
27.5 m²
Total heating surface
116.3 m²

Power plant

Driver diameter
1,600 mm
Boiler pressure
12.5 bar
Expansion type
simple expansion
Cylinders
two, 470 x 610 mm

Power

Power source
steam
Indicated power
558 kW (759 PS)
Top speed
90 km/h
Starting effort
89.5 kN

Calculated values

Factor of adhesion
1 : 4.30
Optimal speed
39 km/h
Power-to-weight ratio
12.1 kW/t
Heating Surface Equivalent
194.5 m²
Cylinder volume/HSE
1 : 1,088.47
Adhesive weight/Total
1 : 1.18
Tractive force/Heating surface
1 : 16.07
Grate area/Heating surface
1 : 71.36
Firebox/Tube surface
1 : 7.77
Total/Superheater
1 : 3.23
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