PKP class OKl27

4 ft 8+1⁄2 in) standard gaugeLeading 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 typeCoalFuel 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:​ • Grate area2.6 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, outsideCylinder size540 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)

Career
Operators	PKP » DRB » PKP
Class	PKP: OKl27 DRB: 7512
Numbers	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

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:

• OKl27-10 in Skierniewice (as an exhibit),
• OKl27-26 in Warsaw Railroad Museum (as an exhibit),
• OKl27-27 in Gdynia (as an exhibit), and
• OKl27-41 in Chabówka.

See also

• PKP classification system

References

• 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.

Diesel

Standard gauge	SM01 SM02 SM03 SM04 SM15 SM25 SM30 SP30 SM31 SP32 SM40 ST40 SM41 SM42 SP42 SU42 ST43 ST44 SP45 ST45 SU45 SU46 SP47 SM48 ST48 SU160
Narrow gauge	Ld1 Lyd1 Lyd2 Lxd2

ElectricSteam

Standard gauge*	Ok22 OKl27 OKz32 Ol49 Os24 Pm36 Pt31 Pt47 Pu29 TKh49 TKt48 Tr21 Ty23 Ty37 Ty42 Ty43 Ty45 Ty51 Ty246
Standard gauge**	Od2 Oi1 Oi2 Ok1 OKi1 OKi2 OKl2 OKl12 OKo1 Ol12 Ot1 Pd1 Pd4 Pd5 Pf1 Pf12 Pk1 Pk2 Pm2 Pm3 Pn12 Pt1 Th1 Th3 Th24 Ti1 Ti2 Ti4 Ti11 Ti12 Ti16 Ti17 TKh1 TKh2 TKi1 TKi3 TKp1 TKp11 TKp101 TKt1 TKt2 TKt3 TKw1 TKw2 Tp1 Tp2 Tp3 Tp4 Tp15 Tp102/104 Tr1 Tr5 Tr6 Tr11 Tr12 Tr20 Tr201/203 Tr202 Tw1 Tw12 Ty1 Ty2 Ty3 Ty4 Ty5
Narrow gauge	Px27 Px29 Px38 Px48 Px49 T49 Tw47 Tw53 Tx23 Tx26

Multiple units

Electric	14WE/EN61 19WE 33WE 35WE 36WE EW51 EW52 EW53 EW54 EW55 EN56 EN57 EW58 ED59 EW60 EN62/EN76/EN96 ED70 EN71 ED72 ED73 ED74 EN75/ER75/ED160 EN77 ED78 EN80 EN81 EW90 EW91 EW92 EN94 EN95 EN97 EN100 ED161 ED250
Diesel	222M 810** MR/MRD** SN51 SN52 SN60 SN61 SD80** SN80 SN81 SN82** SN83** SN84** SD85** SA101 SA102 SA103 SA104 SA105 SA106 SA107 SA108 SA109 SA110 SA131 SA132 SA133 SA134 SA135 SA136 SA137 SA138 SA139 VT627**

Metro cars