The reference for locomotives and railcars


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Prussian S 102
German Reichsbahn class 172
Germany | 1914 | 124 produced
The 4051 of the Dutch State Railways was their only S 10<sup>2</sup>
The 4051 of the Dutch State Railways was their only S 102
D.C. Gerdessen / Nederlandse Spoorwegen / CC-BY 4.0

Because the S 10 from Schwartzkopff was not convincing with its four-cylinder engine and because of its high fuel consumption, Vulcan developed an almost identical successor. The biggest difference in the resulting S 102 was that the engine only had three cylinders. Due to the omission of the fourth cylinder, the diameter of the remaining cylinders was increased from 430 to 500 mm, while the stroke remained the same. Now that there was only one cylinder inside the frame, maintenance was made a little easier.

Although the new model was more powerful than the original S 10, it still did not quite match the performance of the Henschel compound locomotives. In everyday life, trains up to 400 tonnes were pulled at 100 km/h, while the S 101 of the 1914 type pulled 450 tonnes at the same speed. The difference became even greater on inclines. Despite the inferiority compared to the sister model, 124 examples were built, which later became the class 172 at the Reichsbahn. In addition, these locomotives were used to test various innovations, albeit not very successfully.

Three of them were fitted with uniflow cylinders as they were used on ships and locomobiles. However, since no significant advantages could be achieved with this, the locomotives were reverted to the standard. Higher boiler pressures were tested on three other locomotives during the Reichsbahn era. Two received boilers with a medium pressure of 25 bars, with which they achieved the same performance as the class 03. Since the boilers had been damaged over time, they were later restored to their original condition. A similar fate befell the high-pressure locomotive H 17 206, which was designed for a boiler pressure of 60 bars and whose engine was converted to compound action. Series production of this variant would have been considerably more expensive, so it was converted back to the original version in 1929 and retired in 1936.

Sectional drawing with dimensions
Sectional drawing with dimensions
Die Lokomotive, June 1915

After the Second World War there were still 88 examples, all of which were in West Germany. They were decommissioned in 1948 and thus did not live to see the founding of the Bundesbahn.

Axle config4-6-0 (Ten-wheeler) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length69 ft 6 5/8 in
Wheelbase29 ft 10 1/4 in
Fixed wheelbase15 ft 5 1/16 in
Total wheelbase57 ft 3 13/16 in
Empty weight163,010 lbs
Service weight177,075 lbs
Adhesive weight114,750 lbs
Total weight317,509 lbs
Axle load38,250 lbs
Water capacity8,321 us gal
Fuel capacity16,535 lbs (coal)
Power sourcesteam
Indicated power1,184 hp (883 kW)
Optimal speed24 mph
Top speed75 mph
Starting effort31,927 lbf
Power Plant
Driver diameter78 in
Boiler pressure203 psi
Expansion typesimple
Cylindersthree, 19 11/16 x 24 13/16 in
Grate area30.4 sq ft
Firebox area152.5 sq ft
Tube heating area1,495.3 sq ft
Evaporative heating area1,647.8 sq ft
Superheater area662 sq ft
Total heating area2,309.8 sq ft
Calculated Values
steam locomotive
last changed: 01/2022

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