Pf11

 

Pf11_1

 

KkStB 108.04 (BMMF 86/1902) on a turntable, location and date unknown. This locomotive later became ČSD 275.004 and remained in service until July 1935. Source: www.pl.wikipedia.org. This heavily retouched photo is most probably a collage of at least three different pictures. But it looks great…

 

 

Südbahn 108.215 (StEG 3086/1903), photographed at the Wien Südbahnhof shortly after delivery. Source: www.commons.wikimedia.org.

 

 

 

 

 

Between 1901 and 1910 Austro-Hungarian state railways Kaiserlich-königliche österreichische Staatsbahnen (KkStB) took delivery of 25 express locomotives classed 108. They were built by BMMF (eleven), Wiener Neustadt (eight) and StEG (six). Class 108 ran on saturated steam, featured four-cylinder compound steam engine and, for the first time in the KkStB fleet, 2-2-1 axle arrangement. Last nine engines, built from 1905 onwards, were fitted with modified boilers, with 314 flues instead of 329, and their empty weight was marginally lower. These powerful and fast for their time locomotives (140 km/h has been reported) hauled express trains from Vienna to Praha and Kraków. Eleven similar locomotives, differing in minor details, were built between 1903 and 1908 for Südbahn by Wiener Neustadt (three) and StEG (eight). They were assigned service numbers 211 through 221.

After WWI Czechoslovakian state railways ČSD took over 20 engines from KkStB. Three more (108.03, 108.06 and 108.07) went initially to Austrian state railways BBÖ, but soon were also passed over to ČSD. 108.14 was taken over by Romanian state railways CFR and retained its original service number; it was withdrawn before 1934. All former Südbahn engines remained in Austria and were given BBÖ service numbers 108.01 through 11. Last three were withdrawn in 1935.

Polish state railways received just one engine of this type, 108.15 (StEG 3068/1903). Its service in Poland was, however, destined to be short, as in 1924 it was passed over to ČSD. Class designation Pf11 was earmarked for this type, but never actually assigned. No details concerning service with PKP are available. According to EZ, Polish locomotive was in fact 108.14, although all other sources confirm that this particular example went to CFR. Czechoslovakian engines, eventually classed 275.0 (ex-PKP engine became 275.14), remained in service until late 1940s; the last one, 275.010 (formerly 108.10, WrN 4516/1903) was written off in 1950. Seven served for a few more years as stationary boilers. No locomotive of this type has survived until today.

 


Main technical data

 

No.

Parameter

Unit

Value

1.

Years of manufacture

-

1901 – 1910

2.

Total built / used in Poland

-

361) / 1

3.

Tender class

-

4.

Axle arrangement

-

2-2-1

5.

Design maximum speed

km/h

100

6.

Cylinder bore

mm

2 X 350 /

2 X 600

7.

Piston stroke

mm

680

8.

Engine rating

kW/hp

910 / 1240

9.

Tractive effort

kG

10.

Boiler pressure

MPa

1.54

11.

Grate dimensions

m X m

3.53 m2

12.

Firebox heating surface

m2

16.60 /16.462)

13.

Distance between tube plates

mm

4000

14.

Number of flue tubes

-

329 / 3142)

15.

Heating surface of flue tubes

m2

210.90 / 201.282)

16.

Number of smoke tubes

-

-

17.

Heating surface of smoke tubes

m2

-

18.

Evaporating surface, total

m2

227.50 / 217.742)

19.

Superheater heating surface

m2

-

20.

Diameter of drivers

mm

2100

21.

Diameter of idlers front/rear

mm

995 / 1258

22.

Total weight, empty

kg

61 000 / 60 6502)

23.

Total weight, working order

kg

67 800 / 68 3002)

24.

Weight on drivers, working order

kg

29 000

25.

Weight with tender, empty

kg

26.

Weight with tender, working order

kg

27.

Maximum axle load

T

14.5

28.

Axle base (with tender)

mm

29.

Overall length (with tender)

mm

11 787

30.

Brake type

-

Hardy

 

1)     Including those for Südbahn.

2)     Last 9 examples.

 

 

References and acknowledgments

 

-       LP, KT, EZ vol. 1, ITFR;

-       www.pl.wikipedia.org