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
MFFE 714 in a works photograph.
Number(s)
  • MFFE: 701–750
  • DRG 91 1901–1950
  • DR 91 6401–6404
Quantity50+6
Manufacturer
Year(s) of manufacture1907–1922
Retired1935–1970
Wheel arrangement2-6-0T
Axle arrangement1′C n2t
TypeGt 34.11, Gt 34.12
Track gauge1,435 mm (4 ft 8 12 in)
Length over buffers10,375 mm (34 ft 12 in)
Height4,150 mm (13 ft 7 38 in)
Empty weight35.68–37.40 t (35.12–36.81 long tons; 39.33–41.23 short tons)
Service weight45.24–46.8 t (44.53–46.06 long tons; 49.87–51.59 short tons)
Adhesive weight35.6–36.6 t (35.0–36.0 long tons; 39.2–40.3 short tons)
Axle load11.8–12.2 t (11.6–12.0 long tons; 13.0–13.4 short tons)
Top speed45–50 km/h (28–31 mph)
Indicated Power470 PS (346 kW; 464 hp)
Coupled wheel diameter1,150 or 1,200 mm (3 ft 9 14 in or 3 ft 11 14 in)
Leading wheel diameter800 mm (2 ft 7 12 in)
Valve gearWalschaerts (Heusinger)
No. of cylindersTwo
Cylinder bore410 mm (16 18 in)
Piston stroke580 mm (22 1316 in)
Boiler Overpressure12 kgf/cm2 (1,180 kPa; 171 lbf/in2)
No. of heating tubes173
Heating tube length3,700 mm (12 ft 1 34 in)
Grate area1.60 m2 (17.2 sq ft)
Radiative heating area7.41 m2 (79.8 sq ft)
Tube heating area92.5 m2 (996 sq ft)
Evaporative heating area99.90 m2 (1,075.3 sq ft)
Water capacity4.3–5.6 m3 (950–1,230 imp gal; 1,100–1,500 US gal)
Fuel1,500 kg (3,300 lb) coal

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

References

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