DRG Class 24

(Redirected from PKP class Oi2)

The DRG Class 24 steam engines were German standard locomotives (Einheitslokomotiven) built for the Deutsche Reichsbahn between 1928 and 1939 to haul passenger trains.

DRG Class 24
DR Class 37.10
PKP Oi2
24 009 in the Bochum-Dahlhausen railway museum, October 1985
Type and origin
Power typeSteam
Builder
Build date1928–1939
Total produced95
Specifications
Configuration:
 • Whyte2-6-0
 • UIC1C h2
 • GermanP 34.15
Gauge1,435 mm (4 ft 8+12 in)
Leading dia.0,850 mm (2 ft 9+12 in)
Driver dia.1,500 mm (4 ft 11 in)
Tender wheels1,000 mm (3 ft 3+38 in)
Wheelbase:
 • Axle spacing
(Asymmetrical)
  • 2,700 mm (8 ft 10+14 in) +
  • 1,800 mm (5 ft 10+78 in) +
  • 1,800 mm (5 ft 10+78 in) =
 • Engine6,300 mm (20 ft 8 in)
 • Tender
  • 1,900 mm (6 ft 2+34 in) +
  • 1,900 mm (6 ft 2+34 in) =
  • 3,800 mm (12 ft 5+58 in)
 • incl. tender13,270 mm (43 ft 6+12 in)
Length:
 • Over headstocks15,655 mm (51 ft 4+38 in)
 • Over buffers16,955 mm (55 ft 7+12 in)
Height4,165 mm (13 ft 8 in)
Axle load15.1 t (14.9 long tons; 16.6 short tons)
Adhesive weight45.2 t (44.5 long tons; 49.8 short tons)
Empty weight52.0 t (51.2 long tons; 57.3 short tons)
Service weight57.4 t (56.5 long tons; 63.3 short tons)
Tender type3 T 16
Fuel typeCoal
Fuel capacity6 t (5.9 long tons; 6.6 short tons)
Water cap.16 m3 (3,500 imp gal; 4,200 US gal)
Firebox:
 • Grate area2.04 m2 (22.0 sq ft)
Boiler:
 • Pitch2,700 mm (8 ft 10+14 in)
 • Tube plates3,800 mm (12 ft 5+58 in)
 • Small tubes44.5 mm (1+34 in), 114 off
 • Large tubes118 mm (4+58 in), 32 off
Boiler pressure14 bar (14.3 kgf/cm2; 203 psi)
Heating surface:
 • Firebox8.7 m2 (94 sq ft)
 • Tubes53.7 m2 (578 sq ft)
 • Flues42.0 m2 (452 sq ft)
 • Total surface104.4 m2 (1,124 sq ft)
Superheater:
 • Heating area37.18 m2 (400.2 sq ft)
CylindersTwo, outside
Cylinder size500 mm × 660 mm (19+1116 in × 26 in)
Valve gearWalschaerts with Kuhn slides
Loco brakeAutomatic, single-chamber, Knorr compressed-air brakes, operating on coupled and carrying wheels from the front
Performance figures
Maximum speed90 km/h (56 mph)
Indicated power920 PS (677 kW; 907 hp)
Career
Operators
Retired1972
DispositionFour preserved, remainder scrapped

History

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These engines, nickname the 'prairie horse' (Steppenpferd) were developed specially for the long, flat routes in West and East Prussia. 95 examples were built by the firms of Schichau, Linke-Hofmann and others. The two units with operating numbers 24 069 and 24 070 were supplied by Borsig with a medium pressure boiler. These locos ran with a boiler overpressure of 25 bar (25.5 kgf/cm2; 363 psi), but were rebuilt by DB in 1952.

The Deutsche Bundesbahn took over 38 locomotives and retired them by 1966. The last one with the DB was locomotive number 24 067, which was stabled in Rheydt and taken out of service there in August 1966. The engines were given operating numbers 24 001 to 24 095.

Engine numbers 24 002, 004, 009, 021 and 030 were left with the DR after the Second World War. They were all stabled in Jerichow shed in 1960 and their sphere of operations until 1968 was the branch line network of the Kleinbahn AG in Genthin. No. 24 009 was re-numbered in 1970 to 37 1009 and was used as a reserve breakdown engine in Güsten and Stendal. In 1972 it was sold to the West German railway magazine Eisenbahn-Kurier.

Thirty-four locomotive remained in Poland after the Second World War, where PKP classified them as Oi2. They served until the last one was withdrawn in 1976. One of the preserved locomotives in Germany, no. 24 083, had been in service in Poland.

The locomotives were equipped with 3 T 16 and 3 T 17 tenders.

Four Class 24 locomotives have been preserved: three in Germany (24 004, 24 009 and 24 083), and one in Poland (Oi2-29).

See also

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Literature

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  • Klaus-Detlev Holzborn (2015): Der Sonderling 24 061. In: Eisenbahn-Magazin. Nr. 7, ISSN 0342-1902, S. 14.
  • Wenzel, Hansjürgen (2012). Die Baureihe 24. Die kleinste Einheits-Schlepptenderlok (in German). Freiburg: EK-Verlag. ISBN 978-3-88255-124-2.
  • Weisbrod, Manfred; Müller, Hans; Petznik, Wolfgang (1976). Dampflokomotiven deutscher Eisenbahnen, Baureihe 01–39 (EFA 1.1) (in German) (3rd ed.). Düsseldorf: Alba Buchverlag. pp. 184–187. ISBN 3-87094-081-6.