Pd12

 

 

Probably factory photo of the KkStB 605 (later 6.05, Wiener Neustadt 3754/1894). This locomotive later became ÈSD 264.005 and was withdrawn in February 1932. Source: www.pl.wikipedia.org.

 

 

 

 

 

 

Between 1879 and 1897 four major Austrian factories built 213 passenger locomotives for state railways KkStB (in 1905 classed 4) and private operators, in several batches differing in many details. These engines, with the 2-2-0 axle arrangement, 1680 mm drivers and maximum speed of 80 km/h, soon became insufficient for the most prestigious (and heaviest) passenger trains that ran between major cities of the Austro-Hungarian empire. Their replacement in this role was class 6 – the first one designed by Karl Gölsdorf after being appointed the chief of the KkStB design bureau.

Class 6 differed considerably from earlier Austrian passenger locomotives. It featured 2100 mm drivers and high-pitched boiler, in order to facilitate wide grate suitable for burning coal of lower quality. Single-expansion steam engine was replaced by a compound, much favored by Gölsdorf. For the first time Heusinger valve gear was used and boiler was fitted with two steam domes connected with a horizontal tube, later typical for many Austrian locomotives. Maximum speed was increased to 90 km/h, but reportedly 130 km/h was attained on occasions; due to front pony truck running qualities were substantially improved.

Deliveries of class 6 engines between 1894 and 1898 totaled 68 examples, built by three manufacturers: WLF (24), Wiener Neustadt (20) and StEG (24). Initially they were numbered 601 through 668, later renumbered 6.01 through 68. Later examples had slightly modified boilers. Class 6 was replaced on production lines by class 106, which featured several improvements, but was otherwise similar in overall performance and appearance. From 1917 onwards first 54 examples were fitted with class 106 boilers, differing in minor details (including slightly larger grate and Coale safety valves).

After the war BBÖ kept twenty locomotives of this type, which remained in service until 1932. As many as 32 went to Czechoslovakia and 28 were classed 264.0 in mid-1920s, the remaining four being withdrawn earlier. Last two 264.0s were written off in 1941. Five KkStB locomotives were captured by the Russians and ended up in the USSR. 6.40 (WLF 990/1896) was damaged beyond repair in an accident in March 1916. The remaining ten engines went to PKP and nine of them were classed Pd12 in mid-1920s; 6.65 (StEG 2626/1898) was written off in 1920, before new designation system came into use. Seven Pd12s were withdrawn between 1927 and 1936. Pd12-3 (former 6.39, WLF 989/1896) remained in service until April 1939 and Pd12-5 (6.43, WLF 993/1896) was captured by the Soviets in 1939; nothing is known on its subsequent fate. Not a single example of this locomotive has been preserved.

 


Main technical data

 

No.

Parameter

Unit

Value

1.

Years of manufacture

-

1894 – 1898

2.

Total built / used in Poland

-

68 / 10

3.

Tender class

-

17C111)

4.

Axle arrangement

-

2-2-0

5.

Design maximum speed

km/h

90

6.

Cylinder bore

mm

2 X 500 /

2 X 740

7.

Piston stroke

mm

680

8.

Engine rating

kW/hp

710 / 965

9.

Tractive effort

kG

 

10.

Boiler pressure

MPa

1.32

11.

Grate dimensions

m X m

2.9 m2

12.

Firebox heating surface

m2

11.00

13.

Distance between tube plates

mm

4400

14.

Number of flue tubes

-

205

15.

Heating surface of flue tubes

m2

144.50

16.

Number of smoke tubes

-

-

17.

Heating surface of smoke tubes

m2

-

18.

Evaporating surface, total

m2

155.50

19.

Superheater heating surface

m2

-

20.

Diameter of drivers

mm

2100

21.

Diameter of idlers front/rear

mm

995 / -

22.

Total weight, empty

kg

49 400 / 51 5002)

23.

Total weight, working order

kg

55 400 / 57 0002)

24.

Weight on drivers, working order

kg

28 800 /29 0002)

25.

Weight with tender, empty

kg

66 400

26.

Weight with tender, working order

kg

94 400

27.

Maximum axle load

T

14.4

28.

Axle base (with tender)

mm

12 994

29.

Overall length (with tender)

mm

16 605

30.

Brake type

-

Hardy

 

1)      Possibly also other tender classes.

2)      Later examples.

 

References and acknowledgments

 

-        LP, KT, EZ;

-        www.pl.wikipedia.org