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KPEV T5² Berlin 2064 (Henschel 5272/1899), factory photo. Source: Lokomotiven der alten deutschen Staats- und Privatbahnen by Hermann Maey and Erhard Born, Transpress, 1983.

T5² side drawing from TB vol 2, © Lokomotiv-Revue.

In 1899 Prussian state railways KPEV ordered tank locomotives with the 2-2-0 axle arrangement for Berliner Stadtbahn and Wannseebahn. They were fitted with saturated steam boilers and steam engines similar to those of Musterblatt III 4i (later class T5¹), the main differences being larger firebox, number of flues increased from 171 to 218 and steam engine with cylinders of slightly increased diameter. Maximum speed of 75 km/h was retained, but due to leading two-axle truck running qualities smokebox first were improved. Lack of rear idle axle, together with large drivers, resulted in poor running qualities cab first, so they were less versatile than their predecessors. Total output was modest, including thirty examples from Henschel and six from Grafenstaden, delivered between 1899 and 1900. Initially all were assigned to the Berlin regional management and known as Wannsee-Typ. Following the introduction of new designation system, they were classed T5². With the appearance of more powerful T11 and T12, later built in considerable numbers, they were relegated to light trains or transferred to other managements. Two more were built by Henschel for Eutin-Lübecker Eisenbahn (10446/1911 and 10958/1912, service numbers 5 and 6, respectively).

In 1900 Henschel delivered two engines of this type fitted with the Schmidt-type superheater (s/n 5414 and 5415, Berlin 2069 and 2070). They were the first German tank locomotives running on superheated steam, but turned out not to be entirely satisfactory, so production of the earlier variant continued. In 1924 and 1930 both engines of this type used by Eutin-Lübecker Eisenbahn were also fitted with superheaters.

After WWI newly-formed German railways DRG initially intended to keep twenty examples, but finally only two were retained, numbered 72 001 and 72 002. Both were withdrawn in late 1920s. After the Eutin-Lübecker Eisenbahn was taken over by DRG in 1941, these service numbers were used for the second time for their ‘5’ and ‘6’. Both survived until 1955, the former with DR and the latter with Hoesch Westfalenhütte in Dortmund.

Polish state railways took only one locomotive of this type, which had been transferred to Bromberg (now Bydgoszcz). This engine (Berlin 2050, later Bromberg 6623, Grafenstaden 4897/1899) was still in use in 1927, but was withdrawn before 1931. Not a single T5² has been preserved. Apart from T5¹, T5² and superheated T5², Prussian class T5 included also ten engines built in 1880 by Grafenstaden for Unterelbeschen Eisenbahngesellschaft (axle arrangement 1-3-1) and ten by MBA Karlsruhe for Main-Neckar-Eisenbahn (four 0-3-0s, 1896, and six 1-3-0s, 1899). None of these served with DRG.

Main technical data

No.	Parameter	Unit	Value
1.	Years of manufacture	-	1899 – 1912
2.	Total built / used in Poland	-	38 / 1
3.	Tender class	-	-
4.	Axle arrangement	-	2-2-0
5.	Design maximum speed	km/h	75
6.	Cylinder bore	mm	2 X 440
7.	Piston stroke	mm	600
8.	Engine rating	kW/hp	440 / 590
9.	Tractive effort	kG	5 600
10.	Boiler pressure	MPa	1.22
11.	Grate dimensions	m X m	1.69 m^2
12.	Firebox heating surface	m^2	8.7
13.	Distance between tube plates	mm	4 000
14.	Number of flue tubes	-	218
15.	Heating surface of flue tubes	m^2	88.1
16.	Number of smoke tubes	-	-
17.	Heating surface of smoke tubes	m^2	-
18.	Evaporating surface, total	m^2	121.0
19.	Superheater heating surface	m^2	-
20.	Diameter of drivers	mm	1 600
21.	Diameter of idlers front/rear	mm	850 / -
22.	Total weight, empty	kg	44 200
23.	Total weight, working order	kg	56 700
24.	Weight on drivers, working order	kg	31 700
25.	Weight with tender, empty	kg	-
26.	Weight with tender, working order	kg	-
27.	Maximum axle load	T	15.9
28.	Axle base (with tender)	mm	6 950
29.	Overall length (with tender)	mm	10 856
30.	Brake type	-	Westinghouse

Note: all data for production locomotives for KPEV (saturated steam).

References and acknowledgments

- LP, TB vol. 2;

- Lokomotiv-Archiv Preußen Band 3 by Andreas Wagner (Bechtermünz Verlag, 1996);

- www.pl.wikipedia.org;

- monographic article by Ryszard Stankiewicz (KMD wol. 1-2/2017).