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Prussian S 101
German Reichsbahn class 1710-12
Germany | 1911 | 261 produced
Locomotive Magazine, December 1912

Since the S 10 was found to consume a lot of water and coal after a short time, the development of a more economical locomotive with a compound engine was started. Although the designation suggests otherwise, the S 101 was not related to the S 10 in terms of design. The class only included express locomotives with a 4-6-0 wheel arrangement, in reality the S 101 was a completely new design and was not based on the P 8 like its predecessor.

The engine was designed according to the de Glehn design, which means that one pair of cylinders acted on the first driving wheel set and the other on the second driving wheel set. So, in contrast to most German four-cylinder compound steam locomotives, the S 101 had the low-pressure cylinders on the inside and the high-pressure cylinders on the outside.

Preserved engine of the 1911 variant with original numbering as Osten 1135 in August 2007 in Potsdam
Preserved engine of the 1911 variant with original numbering as Osten 1135 in August 2007 in Potsdam

Although the locomotives were only completely convincing after a few modifications, the consumption was significantly reduced compared to the S 10. In addition, with an indicated power of around 1,400 hp and a drawbar power of 1,000 hp, they were the most powerful Prussian express locomotives, since no Pacific locomotives were procured in Prussia. 152 examples of the original type were built, 17 of which were for Alsace-Lorraine. Of these, twelve had an engine of the Borries design, in which all cylinders acted on the first coupled axle

Although the first design performed well, there was still potential for improvement. Most notably, the arrangement of the cylinders has been changed to make them more easily accessible for maintenance. In addition, weight savings were implemented in order to be able to install a feedwater heater with the same axle load. As a result, the new locomotive was even more powerful than the first type, so express trains of 500 to 600 tonnes were pulled in everyday life. Although it was slower than some Pacific locomotives from other railway companies with a permitted speed of 120 or 110 km/h, one example reached 152 or 156 km/h depending on the source of the information. A total of 115 engines of the 1914 type were produced.

The Reichsbahn took over 132 units from the first series and 77 from the second and renumbered them into the classes 1710-11 and 1711-12. Their service with the Bundesbahn ended in 1954, with the Reichsbahn only in 1964. In the GDR, two of the engines were converted to pulverized coal firing as a test.

Variantvariant 1911variant 1914
Axle config4-6-0 (Ten-wheeler) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length57 ft 11 11/16 in69 ft 3 1/8 in
Wheelbase29 ft 10 1/4 in31 ft 10 5/16 in
Fixed wheelbase15 ft 5 1/16 in15 ft 1 1/8 in
Total wheelbase57 ft 3 13/16 in59 ft 3 7/16 in
Empty weight168,058 lbs170,715 lbs
Service weight182,300 lbs185,078 lbs
Adhesive weight112,414 lbs114,706 lbs
Total weight325,512 lbs
Axle load37,809 lbs38,338 lbs
Water capacity5,680 us gal8,321 us gal
Fuel capacity15,432 lbs (coal)16,535 lbs (coal)
Power sourcesteam
Indicated power1,400 hp (1,044 kW)1,479 hp (1,103 kW)
Optimal speed45 mph44 mph
Top speed75 mph
Starting effort19,960 lbf21,385 lbf
with start valve23,952 lbf25,662 lbf
Power Plant
Driver diameter78 in
Boiler pressure203 psi218 psi
Expansion typecompound
Cylindersfour, HP: 15 3/4 x 26 in
and LP: 24 x 26 in
Grate area31.8 sq ft33.8 sq ft
Firebox area176.7 sq ft189.3 sq ft
Tube heating area1,583.3 sq ft
Evaporative heating area1,760 sq ft1,772.6 sq ft
Superheater area629.7 sq ft
Total heating area2,389.7 sq ft2,402.3 sq ft
Calculated Values
steam locomotive
De Glehn compound
Von Borries compound
last changed: 01/2022

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