NWE Nos. 11 to 22
| NWE Nos. 11–22 Class 99.590 | |
|---|---|
.JPG) | |
| 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:
- 99 5901: currently undergoing its general inspection in Meiningen,
- 99 5902: available for specials,
- 99 5903: licences expired, in Wernigerode Westentor station.
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.
External links
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