PKP class OKl27

PKP class OKl27 is a class of ordinary passenger (O) tank (K) 2-6-2 (l) steam locomotives designed in 1927 for Polskie Koleje Państwowe (Polish State Railways, PKP). It was the first completely Polish construction. The design was prepared by eng. Bryling.

PKP OKl27
OKl27-41 in Chabówka
Type and origin
Power typeSteam
BuilderCegielski (Poznań)
Build date1928–1933
Total produced122
Specifications
Configuration:
​
 • Whyte2-6-2T
 • UIC1′C1′ h2t
Gauge1,435 mm (4 ft 8+1⁄2 in) standard gauge
Leading dia.860 mm (33.86 in)
Driver dia.1,500 mm (59.06 in)
Trailing dia.860 mm (33.86 in)
Length12.863 m (42 ft 2 in)
Adhesive weight67.7 t (66.6 long tons; 74.6 short tons)
Loco weight85.1 t (83.8 long tons; 93.8 short tons)
Fuel typeCoal
Fuel capacity4.0 t (3.9 long tons; 4.4 short tons)
Water cap.10,000 L (2,200 imp gal; 2,640 US gal)
Firebox:
 • Firegrate area		2.6 m2 (28 sq ft)
Boiler pressure14 kg/cm2 (1.37 MPa; 199 psi)
Heating surface122.7 m2 (1,321 sq ft)
Superheater:
​
 • Heating area45.2 m2 (487 sq ft)
CylindersTwo, outside
Cylinder size540 mm × 630 mm (21.26 in × 24.80 in)
Performance figures
Maximum speed80 km/h (50 mph)
Power output930 PS (680 kW)
Tractive effort103 kN (23,000 lbf)
Career
OperatorsPKP » DRB » PKP
ClassPKP: OKl27
DRB: 7512
NumbersPKP: OKl27-1 to OKl27-122
DRB: 75 1201 to 75 1320

History

Production

Hipolit Cegielski Metal Works in Poznań produced 122 engines in the period of 1928–1933.[1]

Operation

The OKl27 class serviced mainly local transport, especially suburban lines.

Wartime

After the German invasion of Poland in World War II, 107 of the 122 OKl27 locomotives were taken into the Deutsche Reichsbahn fleet as 75 1201 to 75 1307. The remaining 15 were taken into the stock of the Soviet Railways; all but two of which came into German hands and were renumbered 75 1308 to 75 1320.[2]

After the war, most locomotives were restored to Poland and renumbered. While the post-war class remained the same, locomotives were renumbered at random, so a locomotive's pre- and post war identities are (usually) completely different.[3]

Preservation

Four engines have survived:

See also

References
Wikimedia Commons has media related to PKP class OKl27.
  1. Durrant 1972, pp. 109–110.
  2. Hütter (2021), p. 194.
  3. Hütter (2021), pp. 195–197.
  • Durrant, A. E. (1972). The Steam Locomotives of Eastern Europe. Newton Abbot, Devon: David and Charles. ISBN 0-7153-4077-8.
  • Hütter, Ingo (2021). Die Dampflokomotiven der Baureihen 60 bis 91 der DRG, DRB, DB, und DR (in German). Werl: DGEG Medien. pp. 194–197. ISBN 978-3-946594-21-5.
  • "Article at Live Machines site". Retrieved June 6, 2007.
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