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The reference for locomotives and railcars

South Manchurian Railway No. 701 to 712

Manchuria 1918 12 produced
Baldwin works photo Richard Driver collection

These twelve Mikados were built by Baldwin in 1918 for express freight service. They were classified by Baldwin as type 12-38 ¼ E, what stands for twelve wheels, eight of these powered, trucks in the front and rear, and a cylinder diameter of 22 inches. Designed for rails of 80 pounds per yard, they had an axle load of less than 40,000 pounds, making them some of the smaller standard-gauge Mikados built by Baldwin. For service in express freight service, their drivers measured 57 inches, what was a bit larger than the 54 inches of the other Mikados of the Mantetsu. They shared many similarities with the Pacifics 901 to 912 which were built two years later by the same manufacturer.

Technical data

General

Built
1918
Manufacturers
Baldwin
Wheel arrangement
2-8-2 (Mikado)
Gauge
1,435 mm (Standard gauge)

Dimensions and weights

Wheelbase
9.65 m
Total wheelbase
19.22 m
Service mass
89.8 t
Adhesion mass
69.9 t
Total mass
144.2 t
Rigid wheelbase
4.57 m
Axle load
17.5 t
Water capacity
22,712 l
Fuel capacity
12.7 t (coal)

Boiler

Grate area
4.339 m²
Firebox surface
17.466 m²
Tube heating surface
221.76 m²
Evaporative heating surface
239.226 m²
Superheater surface
56.857 m²
Total heating surface
296.1 m²

Power plant

Driver diameter
1,448 mm
Boiler pressure
12.8 bar
Expansion type
simple expansion
Cylinders
two, 559 x 711 mm

Power

Power source
steam
Starting effort
166.3 kN

Calculated values

Factor of adhesion
1 : 4.12
Heating Surface Equivalent
440.3 m²
Cylinder volume/HSE
1 : 792.33
Adhesive weight/Total
1 : 1.29
Tractive force/Heating surface
1 : 11.73
Grate area/Heating surface
1 : 68.24
Firebox/Tube surface
1 : 12.70
Total/Superheater
1 : 4.21
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