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Specifications
Specifications
Configuration:;
• Whyte	2-8-2
• UIC	1′D1′ h2
Gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Leading dia.	1,000 mm (39.37 in)
Driver dia.	1,850 mm (72.83 in)
Trailing dia.	1,200 mm (47.24 in)
Tender wheels	1,000 mm (39.37 in)
Minimum curve	150 m (492 ft 2 in)
Wheelbase:
• Engine	12.200 m (40 ft 0 in)
• Drivers	6.000 m (19 ft 8 in)
• Tender	5.600 m (18 ft 4 in)
Length	23.955 m (78 ft 7 in) (with tender)
Height	4.555 m (14 ft 11 in)
Axle load	18.3 tonnes
Loco weight	106.2 tonnes
Tender weight	68.5 tonnes
Total weight	174.7 tonnes
Tender type	32D29
Water cap.	32 m3 (1,100 cu ft)
Tender cap.	10.0 tonnes
Firebox:
• Grate area	4.51 m2 (48.5 sq ft)
Boiler pressure	15 kg/cm2 (1.47 MPa; 213 psi)
Heating surface	234.2 m2 (2,521 sq ft)
Superheater:;
• Heating area	91.46 m2 (984.5 sq ft)
Cylinders	Two, outside
Cylinder size	630 mm × 700 mm (24.80 in × 27.56 in)
Valve gear	Heusinger

Type and origin
Type and origin
Power type	Steam
Builder	Fablok
Build date	1932–1940
Total produced	110

PKP Pt31
PKP Pt31
	Pt31 locomotive
Power type
Type and origin
Power type	Steam
Builder	Fablok
Build date	1932–1940
Total produced	110
Configuration:;
Specifications
Configuration:;
• Whyte	2-8-2
• UIC	1′D1′ h2
Gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Leading dia.	1,000 mm (39.37 in)
Driver dia.	1,850 mm (72.83 in)
Trailing dia.	1,200 mm (47.24 in)
Tender wheels	1,000 mm (39.37 in)
Minimum curve	150 m (492 ft 2 in)
Wheelbase:
• Engine	12.200 m (40 ft 0 in)
• Drivers	6.000 m (19 ft 8 in)
• Tender	5.600 m (18 ft 4 in)
Length	23.955 m (78 ft 7 in) (with tender)
Height	4.555 m (14 ft 11 in)
Axle load	18.3 tonnes
Loco weight	106.2 tonnes
Tender weight	68.5 tonnes
Total weight	174.7 tonnes
Tender type	32D29
Water cap.	32 m3 (1,100 cu ft)
Tender cap.	10.0 tonnes
Firebox:
• Grate area	4.51 m2 (48.5 sq ft)
Boiler pressure	15 kg/cm2 (1.47 MPa; 213 psi)
Heating surface	234.2 m2 (2,521 sq ft)
Superheater:;
• Heating area	91.46 m2 (984.5 sq ft)
Cylinders	Two, outside
Cylinder size	630 mm × 700 mm (24.80 in × 27.56 in)
Valve gear	Heusinger
Maximum speed
Performance figures
Maximum speed	110 km/h (68 mph)
Power output	2,000 hp (1,500 kW)
Tractive effort	13,500 kgf (29,760 lbf)
Operators
Career
Operators	PKP
Class	Pt31
Numbers	Pt31-1 to Pt31-98
Locale	Poland
Delivered	1932
Retired	1979
Preserved	2
	Pokropiński 2007, p. 254

PKP Class Pt31 is a Polish steam locomotive of Polskie Koleje Państwowe, designed for hauling heavy long-distance passenger trains, built in 1932-1940. The designation stood for fast passenger (P) 2-8-2 (t) steam locomotive designed in 1931.

The locomotive was entirely Polish design, designed in Fablok in Chrzanów. Polish Ministry of Transport ordered two classes of fast passenger locomotives in Polish factories to compare their merits. Fablok 2-8-2 design was to be named Pt29, but the design was delayed and accepted on in 1931, thus becoming Pt31.^[1] Three prototypes were built in 1932 and successfully competed with 4-8-2 Pu29 locomotive - both were similar, but more compact Pt31 better suited Polish turntables.^[1] From 1934, a series production for the PKP followed, and by the outbreak of World War II in 1939, 98 were made, numbered Pt31-1 to 98.^[2] Further twelve were completed in 1940 under German occupation.^[3]

Pt31 became the strongest machines hauling long-distance passenger trains in Poland. A maximum speed was 110 km/h (68 mph). It could achieve at least 105 km/h with a train of 600 tonnes (590 long tons; 660 short tons), or could haul the train of 810 tonnes (800 long tons; 890 short tons) with lower speed.^[2]

During the war, 54 locomotives were captured by the Germans and impressed into service as DR class 19¹, with numbers 101 to 154.^[3] Further twelve were first designated as class 39¹⁰, finally class 19¹, with numbers 155 to 166.^[3] Remaining 44 Pt31 locomotives were captured by the Soviets in Poland, 21 of them had been converted to broad gauge by 1941, transliterated as ПТ-31 class.^[3] A number of Soviet locomotives were captured again by the Germans from 1941, and received German numbers up to 180.^[3]

After World War II, Poland reclaimed 65 locomotives, receiving new numbers Pt31-1 to 66 (number 46 was mistakenly assigned to Pu29-3).^[4] Before that, they temporarilly served in Czechoslovakia as class 488, Austria, Hungary and both German countries.^[5] Three locomotives of wartime production remained on Austrian railways as ÖBB class 919 until 1961, and several broad-gauge remained in the Soviet Union.^[5]

These locomotives were used until 1979 in Poland. Only two were preserved, in non-working condition.^[4] A post-war development was PKP class Pt47.^[6]

References

^ ^a ^b Pokropiński 2007, p. 92-96.
^ ^a ^b Pokropiński 2007, p. 96-98.
^ ^a ^b ^c ^d ^e Pokropiński 2007, p. 98.
^ ^a ^b Pokropiński 2007, p. 104-106.
^ ^a ^b Pokropiński 2007, p. 100-103.
^ Pokropiński 2007, p. 148.

Pokropiński, Bogdan (2007). Parowozy normalnotorowe produkcji polskiej [Normal gauge steam locomotives of Polish manufacture] (in Polish). Warsaw: Wydawnictwa Komunikacji i Łączności. pp. 96–106, 254. ISBN 978-83-206-1617-0.