PKP class Ok22

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PKP Ok22
Ok22-31 in Wolsztyn
Type and origin
Power typeSteam
BuilderHanomag (5)
Fablok (185)
Build date1923, 1928–1934
Total produced190
 • Whyte4-6-0
 • UIC2′C h2
Gauge1,435 mm (4 ft 8 12 in) standard gauge
1,524 mm (5 ft)
Russian Railways
Leading dia.1,000 mm (39.37 in)
Driver dia.1,750 mm (68.90 in)
Wheelbase8.350 m (27 ft 4 34 in)
Length18.612 m (61 ft 34 in)
18.940 m (62 ft 1 58 in)
Height4.625 m (15 ft 2 18 in)
Axle load17 tonnes (17 long tons; 19 short tons)
Adhesive weight51.0 tonnes (50.2 long tons; 56.2 short tons)
Loco weight78.9 tonnes (77.7 long tons; 87.0 short tons)
Tender weight50 tonnes (49 long tons; 55 short tons)
Tender cap.10 t (9.8 long tons; 11 short tons)
 • Firegrate area
4.01 m2 (43.2 sq ft)
Boiler pressure12 kg/cm2 (1.2 MPa; 170 psi)
Heating surface182.1 m2 (1,960 sq ft)
 • Firebox14.1 m2 (152 sq ft)
 • Heating area61.6 m2 (663 sq ft)
CylindersTwo, outside
Cylinder size575 mm × 630 mm (22.6 in × 24.8 in)
Performance figures
Tractive effort123 kN (27,650 lbf)
OperatorsPKP » DRB » PKP
ClassPKP: Ok22
DRB: 3845
NumbersPKP: Ok22-1 to Ok-22-190
DRB: 38 4501 to 38 4630
DispositionTwo preserved, remainder scrapped

PKP class Ok22 is a class of ordinary passenger (O) 4-6-0 (k) steam locomotive designed in 1922 for Polskie Koleje Państwowe (Polish State Railways, PKP). It was the first locomotive designed in Poland after World War I, so the design work was done jointly with Hanomag, based on the Prussian P 8 (PKP class Ok1)



The first five engines were built in Germany by Hanomag in 1923. Polish production started in 1928 and lasted until 1934 after which 185 locomotives had been manufactured by Fablok in Chrzanów;[1] the first Polish-built locomotive (Ok22-6) was ready on December 31, 1928. Polish versions of the locomotive bore some improvements and changes compared with German ones, and were similar to PKP class Ty23. Ok22 locomotives were the first on the PKP to be equipped with electric lights.[citation needed]


After the German invasion of Poland in World War II, most Ok22 locomotives were taken into the Deutsche Reichsbahn fleet as 38 4501 to 38 4630.

Present day[edit]

Only two examples have survived. Ok22-23 in Jaworzyna Śląska and Ok22-31 in Wolsztyn. Ok22-31 is still[when?] operational. It ran until 1997, and after retirement became a stationary exhibit. In 2004 the machine was restored to working order.

See also[edit]


  1. ^ Durrant 1972, p. 108.
  • Durrant, A. E. (1972). The Steam Locomotives of Eastern Europe. Newton Abbot, Devon: David and Charles. ISBN 0-7153-4077-8.
  • "Ok22". Live Machines (in Polish). Retrieved June 6, 2007.