NWE Nos. 11 to 22

NWE Nos. 11–22
Class 99.590
Number(s) NWE Nos. 11–22
99 5901–5905
Quantity 12
Manufacturer Arnold Jung and Meckl. Masch.- u. Waggonbau AG Güstrow (MWG)
Year(s) of manufacture 1897–1901
Retired see text
Axle arrangement B'B n4vt
Type K 44.9
Gauge 1,000 mm (3 ft 3 3⁄8 in)
Length over buffers 8,875 mm
Height 3,900 mm
Width 2,600 mm
Bogie wheelbase 1,400 mm
Overall wheelbase 4,600 mm
Empty weight 28 t
Service weight 34 t
Adhesive weight 34 t
Axle load 8.5 t
Top speed 30 km/h
Indicated Power 255 PSi (190 kW)
Starting tractive effort 55.79 kN
Driving wheel diameter 1,000 mm
Valve gear Heusinger
No. of cylinders 4
LP cylinder bore 425 mm
HP cylinder bore 285 mm
Piston stroke 500 mm
Cylinder pressure high pressure 14 bar, low pressure 5 bar, with starting valve (Anfahrventil) max 7 bar
Boiler Overpressure 14 bar
No. of heating tubes 133
Grate area 1.39 m²
Radiative heating area 5.24 m²
Evaporative heating area 61.34 m²
Water capacity 5 m³
Fuel 1.5 t coal
Parking brake Counterweight handbrake
Locomotive brakes Compressed air m. Z.
Couplers buffer and chain coupler (Balancierhebelkupplung)
Features starting valve (Anfahrventil)

The Nordhausen-Wernigerode Railway Company incorporated twelve Mallet locomotives into its fleet as Numbers 11 to 22. In 1950 the locomotives were designated as Class 99.590 by the East German Deutsche Reichsbahn.

History

In 1897, shortly after the railway company's foundation, the first of a new batch of locomotives was built for the NWE by Arnold Jung in Jungenthal. It was a Mallet engine and was numbered NWE 11. The fleet quickly grew to 12 locos of which nine were made by Jung and three by the Mecklenburgische Maschinen- und Waggonbau AG in Güstrow. The locomotives were very reliable, but six had to be given to the military during the First World War (including all those from Güstrow), and they never returned from their wartime duties. In 1927, one locomotive (NWE 12II) had an accident in Thumkulenthal. The engine, one passenger coach and the luggage van were so badly damaged that they had to be dismantled on the spot. In the mid-1950s, three newly designed locomotives (Neubauloks) of DR Class 99.23–24 came to the Harz Railway. As a result, the Mallets were no longer needed and were given to the Selke Valley Railway. Two were scrapped - 99 5905 in 1975 and 99 5904 in 1990 - but the remaining three are still in the fleet. Nos. 99 5901 and 99 5903 were repainted in their historic green livery with yellow ornamentation. In addition, they were given their old numbers again: NWE 11 and NWE 13II. No. 99 5902 now has the number NWE 12III and runs in green livery. After all its licences expired, maintenance on no. 99 5903 was deferred.

The current fleet of the Harz Narrow Gauge Railways:

A similar locomotive is no. 99 5906.

References

    • Obermayer, Horst J. (1971). Taschenbuch Deutsche Schmalspur-Dampflokomotiven. Stuttgart: Franckh. ISBN 3-440-03818-1. 
    • Röper, Hans; Becker, Helmut; Dill, Werner; Zieglgänsberger, Gerhard (1992). Die Harzquer- und Brockenbahn (3rd expanded ed.). Berlin: Transpress Verlagsgesellschaft. ISBN 3-344-70747-7. 
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