The reference for locomotives and railcars
Staatsspoorwegen class F10
Indonesia | 1912 | 24 produced
Locomotive Magazine, November 1922

The state railway of the Dutch East Indies on Java had the challenge of moving heavy loads on cape-gauge mountain routes with a maximum axle load of 9.5 tonnes and curve radii of up to 140 meters. To solve these requirements, Hanomag proposed a tank locomotive with six coupled axles in one frame in order to be able to avoid building a Mallet with its disadvantages. Among these disadvantages were listed the tendency to slip, flexible and long steam lines, greater complexity of the running gear and unstable mounting of the boiler.

In the locomotive developed as a result, the four inner coupled axles were all firmly mounted in the frame. Only the first and sixth coupled axles could be moved laterally by 30 mm according to the Gölsdorf system, and the leading and trailing axles could be deflected laterally by 100 mm as Adams axles. The water tanks were drawn low between the frames in a new way. Now the boiler could be placed higher without raising the center of gravity to improve accessibility for maintenance.

Schematic drawing with dimensions
Schematic drawing with dimensions
Locomotive Magazine, August 1912

The last batch was built by Werkspoor in the Netherlands. The total of 24 examples built were the first of only two types with the axle configuration 2-12-2T in history, which is why this wheel arrangement is also known as “Javanic”. On the route for which the locomotives were developed, there was a high level of wear on the wheel flanges. They were then moved to another mountain route that had bigger curve radii. There they did very well.

ManufacturerHanomag, Werkspoor
Axle config2-12-2T (Javanic) 
Gauge3 ft 6 in (Cape gauge)
Dimensions and Weights
Wheelbase42 ft 10 15/16 in
Fixed wheelbase12 ft 3 5/8 in
Service weight164,465 lbs
Adhesive weight125,663 lbs
Axle load20,944 lbs
Water capacity2,245 us gal
Fuel capacity6,614 lbs (wood)
Power sourcesteam
Estimated power905 hp (675 kW)
Optimal speed19 mph
Starting effort30,938 lbf
Power Plant
Driver diameter43.4 in
Boiler pressure174 psi
Expansion typesimple
Cylinderstwo, 21 1/4 x 20 1/16 in
Grate area28 sq ft
Firebox area104 sq ft
Tube heating area1,311.5 sq ft
Evaporative heating area1,415.5 sq ft
Superheater area387.5 sq ft
Total heating area1,803 sq ft
Calculated Values
steam locomotive
tank locomotive
last changed: 06/2022

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