Mecklenburg T 4

The Mecklenburg T 4 was a German steam locomotive built for the Grand Duchy of Mecklenburg Friedrich-Franz Railway as a goods train tank locomotive with a leading axle and three coupled axles (2-6-0T). In 1925 it was incorporated in the renumbering plan of the Deutsche Reichsbahn as DRG Class 91.19.

Mecklenburg T 4 DRG Class 91.19
Number(s)	DRG 91 1901–1950 DR 91 6401–6404
Quantity	50+6
Manufacturer	Henschel, O&K
Year(s) of manufacture	1907–1922
Retired	1935–1970
Wheel arrangement	2-6-0T
Axle arrangement	1'C n2t
Length over buffers	10,375 mm
Service weight	46.1 Mp
Adhesive weight	36.1 Mp
Axle load	12.1 Mp
Top speed	45–50 km/h
Indicated Power	470 PS
Driving wheel diameter	1,150/1,120 mm
Leading wheel diameter	800 mm
Cylinder bore	410 mm
Piston stroke	580 mm
Boiler Overpressure	12 kp/cm^2
Grate area	1.60 m^2
Evaporative heating area	96.10 m^2

At the beginning of the 20th century much more powerful locomotives were needed for branch line operations, but the tried and trusted Prussian engines could not be used because the T 9 family was already clearly too heavy. As a result, Henschel-Werke was given an order for what became the Mecklenburg T 4, one of the few locomotive classes to be developed by Mecklenburg itself. Contrary to what is often stated in the literature, these engines had a Krauss-Helmholtz bogie (just like the Prussian T 9.3). The Reichsbahn took over all 50 vehicles. Because the Mecklenburg routes were reinforced, the first locomotives became superfluous as early as the 1930s. Of the 38 locomotives left after the Second World War, two were taken over by the PKP in Poland, four came into the hands of the Deutsche Bundesbahn (DB), 15 had to be given up as reparations and two were retired as a result of serious damage, leaving just 13 with the Deutsche Reichsbahn (DR) in East Germany, of which two in the early 1950s ran in Saxony (for example between Niederschlema and Schneeberg, because damage by the uranium mines meant that only very light vehicles could be employed; eventually even that was no longer possible). The DB retired its locomotives by 1950 due to their low numbers, but continued to use them for a long time as industrial locos in repair shops. In 1949, the DR took over four of the six locomotives built in 1919/1920 for private lines by Henschel and gave them the numbers 91 6401–6404. The last of these engines were withdrawn from service in 1970.

See also

• Grand Duchy of Mecklenburg Friedrich-Franz Railway
• List of Mecklenburg locomotives

References

• Obermayer, Horst J. (1970). Taschenbuch Deutsche Dampflokomotiven. Regelspur (2nd ed.). Stuttgart: Franckh'sche Verlagshandlung. ISBN 3-440-03643-X.