Tp16

 

 

The only suggested candidate for PKP class Tp16 is KkStB class 175. One of two surviving examples, SD 414.404 (ex 175.04, StEG 2416/1894) was photographed at the Jarome depot on August 25, 2004.

 

 

Another picture of this engine, taken on June 14, 2008.

 

 

 

 

The very existence of this class with PKP is uncertain and has been deduced from indirect information. According to some sources, in early 1920s PKP had four engines with certain technical characteristics (weight and some boiler details) corresponding to that of KkStB class 175. It is, however, almost certain that this class designation, even if envisaged for these locomotives, had in fact never been assigned.

Class 175 was a development of earlier and not entirely successful class 75, built for StEG railways in 1890 (initially designated class Vn, later 43, re-classed in October 1909 after StEG had been incorporated into KkStB). Only six 75s were built: all were later taken over by SD (class 414.3) and used mainly for switching and with service trains. In 1894 StEG introduced improved class Vg (later 44), which differed mainly in redesigned boiler. Inordinately large grate (intended to burn low-grade coal) was reduced in area from 4.35 to 3.24 sq.m and total heating surface was increased from 166.1 to 181.5 sq.m, due to longer drum. Number of flues remained unchanged, at 236. Boiler pressure was increased from 10 to 12 bar. All this resulted in overall improvement of boiler performance and tractive effort while maintaining the ability to burn poor coals, but maximum speed remained unchanged, at 35 km/h. This was too small a progress to warrant large-scale production and, although production continued at StEG until 1900, only nineteen examples were built in three small batches differing in minor details. In 1909 they were re-classed 175 by KkStB.

Just like their predecessors, all 175s went to SD (class 414.4) and no mention of their episode with Polish railways has been found in competent Czech or Austrian sources. It seems possible that a few served very briefly with PKP immediately after the war and were later handed over to SD on the basis of international agreements, but as mentioned above this is just a conjecture (such suggestion has been put forward in LP) which still needs support. During WWII all engines of this type served with eskomoravsk Protektortni Drhy and thus were not given DRG numbers; last of them, 414.408 (ex 175.08, StEG 2532/1896) was withdrawn in February 1968.

Given their low number and inconspicuous service, it is somehow surprising that two engines of this type have survived until today, both in Czech Republic. 414.404 (ex 175.04, StEG 2416/1894) is a property of the National Technical Museum, Prague, and can be seen at the Jarome depot; it had been one of the last engines of this type in service. 414.407 (ex 175.07, StEG 2531/1896) has been preserved at the Chomutov depot and is intended for a static display.

 


Main technical data

 

No.

Parameter

Unit

Value

1.

Years of manufacture

-

1894 1900

2.

Total built / used in Poland

-

19 / ?

3.

Tender class

-

?

4.

Axle arrangement

-

0-4-0

5.

Design maximum speed

km/h

35

6.

Cylinder bore

mm

2 X 480

7.

Piston stroke

mm

630

8.

Engine rating

kW/hp

470 / 650

9.

Tractive effort

kG

 

10.

Boiler pressure

MPa

1.22

11.

Grate dimensions

m X m

3.24 m2

12.

Firebox heating surface

m2

12.0

13.

Distance between tube plates

mm

 

14.

Number of flue tubes

-

236

15.

Heating surface of flue tubes

m2

169.5

16.

Number of smoke tubes

-

-

17.

Heating surface of smoke tubes

m2

-

18.

Evaporating surface, total

m2

181.5

19.

Superheater heating surface

m2

-

20.

Diameter of drivers

mm

1220

21.

Diameter of idlers front/rear

mm

- / -

22.

Total weight, empty

kg

48 900

23.

Total weight, working order

kg

55 100

24.

Weight on drivers, working order

kg

55 100

25.

Weight with tender, empty

kg

 

26.

Weight with tender, working order

kg

 

27.

Maximum axle load

T

 

28.

Axle base (with tender)

mm

11 559 / 11 4401)

29.

Overall length (with tender)

mm

16 073 / 16 142 / 15 9711)

30.

Brake type

-

Hardy

1)      Depending on production batch.

 

References and acknowledgments

 

-        www.pospichal.net/lokstatistik (website by Josef Pospichal);

-        LP, EZ vol. 2, ED.