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The reference for locomotives and railcars

South Manchurian Railway Amei class

originally A 50 to 53 and China Railway AM1

Manchuria 1906 4 produced
No. 51 on an ALCO factory photo PD

In order to be able to connect their network to the network of China, Mantetsu had made the change from Cape gauge to standard gauge in 1906. Since the Japanese manufacturers couldn't deliver standard gauge locomotives within a short time, one turned to American manufacturers. The first four locomotives which were ordered came from ALCO and had originally been built for the Chicago Southern. These were 4-4-0 locomotives for regular passenger trains.

At the beginning, Mantetsu designated locomotives of this wheel arrangement as class A, and so they became A 50 to A 53. In the new scheme of 1920, they became the Amei class, what stood for their wheel arrangement that was also called “American” in the USA. Between 1927 and 1933, all four were rented to the private Sitao Railway. After their return to the state railway, they were usually used on secondary lines and sometimes with light trains on main lines. When they came to the China Railway in 1950, they became class AM1.

Technical data

General

Built
1906
Manufacturers
ALCO
Wheel arrangement
4-4-0 (American)
Gauge
1,435 mm (Standard gauge)

Dimensions and weights

Service mass
58.3 t
Adhesion mass
40.3 t
Axle load
20.2 t

Boiler

Grate area
2.42 m²

Power plant

Driver diameter
1,727 mm
Boiler pressure
12.4 bar
Expansion type
simple expansion
Cylinders
two, 457 x 660 mm

Power

Power source
steam
Estimated power
600 kW (816 PS)
Starting effort
84.1 kN

Calculated values

Factor of adhesion
1 : 4.70
Optimal speed
43 km/h
Power-to-weight ratio
10.3 kW/t
Adhesive weight/Total
1 : 1.45
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