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PKP class OKl27


PKP class OKl27

OKl27-41 in Chabówka
Type and origin
Power type Steam
Builder Cegielski (Poznań)
Build date 1928–1933
Total produced 122
Configuration 2-6-2T
UIC classification 1′C1′ h2t
Gauge 1,435 mm (4 ft 8 12 in) standard gauge
Leading wheel
860 mm (33.86 in)
Driver diameter 1,500 mm (59.06 in)
Trailing wheel
860 mm (33.86 in)
Length 12.863 m (42 ft 2 in)
Weight on drivers 67.7 t (66.6 long tons; 74.6 short tons)
Locomotive weight 85.1 t (83.8 long tons; 93.8 short tons)
Fuel type Coal
Fuel capacity 4.0 t (8,800 lb)
Water capacity 10,000 l (2,200 imp gal; 2,640 US gal)
Boiler pressure 14 kg/cm2 (1.37 MPa; 199 psi)
Firegrate area 2.6 m2 (28 sq ft)
Heating surface:
– Total
122.7 m2 (1,321 sq ft)
Superheater area 45.2 m2 (487 sq ft)
Cylinders Two, outside
Cylinder size 540 mm × 630 mm (21.26 in × 24.80 in)
Performance figures
Maximum speed 80 km/h (50 mph)
Power output 930 PS (680 kW)
Tractive effort 103 kN (23,000 lbf)
Operator(s) PKP » DRB » PKP
Class PKP: OKl27
DRB: 7512
Number(s) PKP: OKl27-1 to OKl27-122
DRB: 75 1201 to 75 1320

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.


  • History 1
    • Production 1.1
    • Operation 1.2
    • Wartime 1.3
    • Preservation 1.4



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


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


After the German invasion of Poland in World War II, 120 of the 122 OKl27 locomotives were taken into the Deutsche Reichsbahn fleet as 75 1201 to 75 1320.[2]


Four engines have survived: OKl27-10 in Skierniewice (as an exhibit), OKl27-26 in Warsaw Railroad Museum (as an exhibit), OKl27-27

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