DR Class 25.10

The steam locomotives of DR Class 25.10 were passenger train locomotives built for the Deutsche Reichsbahn (DR) in East Germany after World War II.

DR Class 25.10
Type and origin
BuilderLokomotivbau "Karl Marx" Babelsberg
Build date1954–1955
Total produced2
Specifications
Configuration:
​
 • Whyte2-8-0
 • UIC1′D
 • German25 1001: S 45.18
25 1002: S 45.17
Gauge1,435 mm (4 ft 8+1⁄2 in)
Leading dia.1,000 mm (3 ft 3+3⁄8 in)
Driver dia.1,600 mm (5 ft 3 in)
Length:
​
 • Over beams23,300 mm (76 ft 5+1⁄4 in)
Axle load18.0 tonnes (17.7 long tons; 19.8 short tons)
Adhesive weight72.0 tonnes (70.9 long tons; 79.4 short tons)
Service weight89.0 tonnes (87.6 long tons; 98.1 short tons)
Tender type25 001: 2′2′ T 30
(as 25 1002: 2′2 T28Kst)
25 1001: 2′2′ T 27.5
Fuel capacity12 t coal / 18.5 t brown coal dust (10 t coal dust with 2′2 T30)
Water cap.27.5–30.0 m3 (970–1,060 cu ft) or 27,500–30,000 litres (6,000–6,600 imp gal; 7,300–7,900 US gal)
Boiler pressure16 bar (1.60 MPa; 232 psi)
Heating surface:
 • Firebox		3.76 m2 (40.5 sq ft)
 • Radiative25 001: 17.5 m2 (188 sq ft)
25 1001: 20 m2 (220 sq ft)
 • Evaporative25 001: 171.8 m2 (1,849 sq ft)
25 1001: 158.60 m2 (1,707.2 sq ft)
Superheater:
​
 • Heating area25 001: 61 m2 (660 sq ft)
25 1001: 65.00 m2 (699.7 sq ft)
Cylinders2
Cylinder size600 mm (23+5⁄8 in)
Piston stroke660 mm (26 in)
Performance figures
Maximum speed100 km/h (62 mph)
Indicated power1,750 kW
Career
NumbersDR 25 1001 – 25 1002
Retired1967

History

The Class 25.10 was developed by the DR in 1954. It was built primarily with heavy passenger trains in mind, but was also intended to handle goods traffic. The first of the two trials locomotives to be manufactured was equipped with a mechanical stoker for lump coal. It was given the operating number 25 001. The second example had coal dust firing and was allocated number 25 1001. Only the coal dust fired vehicle was convincing enough, which resulted in the conversion of the first engine to coal dust firing as well in 1958 and its renumbering to 25 1002. The engines did not go into full production however, because the DR Class 23.10 had been designed and built. The makers were the VEB Lokomotivbau "Karl Marx" in Potsdam-Babelsberg.

The two engines were mainly stationed at Arnstadt, where they hauled passenger trains to Weimar, Saalfeld, Erfurt and Meiningen. For a short time, from 1960 to 1962, the engines were homed at Senftenberg depot. However the numerous cracks in the plate frame often required repair and the locomotives were frequently out of service. The 25.10s were retired as early as 1964 and scrapped at Nordhausen in 1968.

Number 25 1001 was equipped with a coal dust tender of Class 2'2' T 27.5. Number 25 001 had a 2'2' 30 tender, which was replaced in 1958 by the coal dust tender of 44 054, when it was converted to coal dust firing. The locomotive was renumbered to 25 1002.

See also

References
    • Weisbrod, Manfred; Müller, Hans; Petznik, Wolfgang (1976). Dampflokomotiven deutscher Eisenbahnen, Baureihe 01–39 (EFA 1.1) (in German) (3rd ed.). Düsseldorf: Alba Buchverlag. pp. 187–190. ISBN 3-87094-081-6.
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