RüKB Nos. 51Mh to 53Mh

Lenz Class M, Mh
RüKB 51Mh–53Mh
Class 99.463
Number(s) RüKB 51Mh–53Mh
DR 99.4631–4633
Quantity 3
Manufacturer Stettiner Maschinenbau AG Vulcan
Year(s) of manufacture 1913, 1914, 1925
Wheel arrangement 0-8-0
Axle arrangement D n2t / D h2t *
Type K 44.6
Gauge 750 mm
Length over buffers 7,724 mm; 8,000 mm *
Height 3,150 mm; 3,200 mm *
Width 2,200 mm
Overall wheelbase 3,400 mm, 3,450 mm *
Empty weight 18.5 t; 20.5 t *
Service weight 23.5 t; 25.5 t *
Top speed 30 km/h
Indicated Power 200 PSi / 147 kW
235 PSi / 173 kW *
Starting tractive effort 40.69 kN
Coupled wheel diameter 850 mm
Driving wheel diameter 850 mm
Valve gear Heusinger with lifting link, Gegenkurbel voreilend
No. of cylinders 2
Cylinder bore 350 mm
Piston stroke 400 mm
Boiler Overpressure 12 bar
Grate area 0.90 m²
Radiative heating area 3.52 m²
Superheater area 13.03 m² *
Evaporative heating area 46.7 m²
33.77 m²
Water capacity 2.2 m³
Fuel 0.8 t coal
* 99 4633

The RüKB Nos. 51Mh–53Mh were German narrow gauge steam locomotives operated by the Rügen narrow gauge railway on the island of Rügen in the Baltic Sea. They were absorbed in 1949 into the Deutsche Reichsbahn in East Germany as their Class 99.463.

History

In 1913 and 1914 the Pomeranian provincial authorities, who had running powers for the following narrow gauge lines, bought a total of eight eight-coupled locomotives from Vulcan in Stettin grouping them as Class M:

Because they proved themselves well, in 1925 a second locomotive was procured for both the GJK and the RüKB. These two engines were amongst the first superheated steam locomotives, unlike the first batch. They were therefore classified as the Mh.

Because the superheated locomotives performed even better, in 1928 the RüKB decided to convert their older machines to superheating.

After the RüKB was taken over by the Deutsche Reichsbahn in 1949, the three engines were given the new running numbers 99 4631 to 99 4633. In 1992 nos. 99 4632 and 4633 were given new boilers and cylinders at Raw[1] Görlitz. Both locos were finally in service in the original green RüKB livery as locomotives 52 and 53 Mh. No. 99 4631 became a monument from 1984 to 2002 at Lehrte but is now back with the RüKB, the others are still in operation as before on the island of Rügen. No. 99 4632 hase been working in black Reichsbahn colours since 2003.

See also

References

  1. ↑ Reichsbahnausbesserungswerk or 'Reichsbahn repair shop'

Sources

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