The locomotive was the only unit to be built of a planned series of standard superheated steam locomotives with the axle arrangements 1'C1', 1'D1' and 1'E1', that the Nordhausen-Wernigerode Railway Company (NWE), the Gernrode-Harzgerode Railway Company and the South Harz Railway Company had ordered from Friedrich Krupp AG for replacing their older, less economic saturated steam engines. In standardising their designs, it was envisaged that as many parts of the locomotives as possible would be used across the whole range in the interests of economic production, simplified spare part stock holdings and easier maintenance and servicing. But because the development order was not given by the Deutsche Reichsbahn and because different construction conventions were followed in some cases, these were not seen as Einheitsloks, the standard locomotives produced by the DR between the wars. As a result of the outbreak of World War II, however, only the prototyped of the 1'C1' version was built in 1939 by Krupp; orders for the other engines were cancelled.
The prototype locomotive was accepted into service by the NWE as No. 21 (the second to carry that number) and, following the takeover of the NWE by the East German Deutsche Reichsbahn in 1949, was renumbered to 99 6001. In 1970 the loco was given the computer number 99 6001-4.
In 1956 the engine was transferred, initially temporarily, from the Harz Railway to the Selke Valley Railway. In 1961 this became permanent. After the re-joining of the two lines in 1983/1984 it was once again used for duties on the Harz Railway, for example to head the first scheduled passenger train between Gernrode and Hasselfelde via Stiege on 3 June 1984.
No. 99 6001 in green, nickname Laubfrosch ("tree frog")
Between 1991 and 1994 it did brief service in green livery as no. 21 in charge of the heritage train (Traditionszug), a special made up of historic coaches, which the Mallet locomotives to that point could not haul as their brakes were not compatible with the new compressed-air brakes of the train. In addition it carried out duties from its home station of Gernrode.
Technical featuresedit
In designing and building the NWE 21II the firm of Krupp made extensive use of welding, even for the boiler, in contrast with the contemporary design approach of the Reichsbahn Einheitslokomotiven.
The three driven wheelsets are fixed firmly in a bar frame with a 70 mm side thickness (Wangenstärke). The two front and rear carrying axles are able to swing out radially and are housed in a Bissell truck.
The two outside cylinders, which are slightly tilted to cope with the constraints of the rail gauge, are driven by Heusinger valve gear with Kuhn slides. The factory-fitted Schulz piston valves were late replaced by Trofimoff piston valves. These gave better running performance when the locomotive was free-running (Leerlauf) and the regulator was closed, because they practically relieve the cylinder of its job as an air pump when the steam pressure is released.
Together with the locomotives of Class 99.32, which were also permitted to run at up to 50 km/h (31 mph), the engine was one of the five narrow gauge locomotives in Germany with the highest top speed.
Referencesedit
Obermayer, Horst J. (1971). Taschenbuch Deutsche Schmalspur-Dampflokomotiven. Stuttgart: Franckh. ISBN3-440-03818-1.
Röper, Hans; Becker, Helmut; Dill, Werner; Zieglgänsberger, Gerhard (1992). Die Harzquer- und Brockenbahn (3rd expanded ed.). Berlin: Transpress Verlagsgesellschaft. ISBN3-344-70747-7.
Wikimedia Commons has media related to NWE Nr. 21.
Data sheet at Freundeskreis Selketalbahn
January 01, 1970
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This article includes a list of references related reading or external links but its sources remain unclear because it lacks inline citations Please help improve this article by introducing more precise citations December 2014 Learn how and when to remove this message The NWE No 21II later DR 99 6001 is a narrow gauge steam locomotive that was built in 1939 for a track gauge of one metre and is still on duty with the Harz Narrow Gauge Railways HSB today when NWE No 21DR Class 99 600Type and originBuilderKrupp EssenBuild date1939Total produced1Specifications GermanK 35 10Gauge1 000 mm 3 ft 3 3 8 in metre gaugeDriver dia 1 000 mm 3 ft 3 3 8 in Carrying wheel diameter600 mm 1 ft 11 5 8 in Minimum curve40 m 131 23 ft Wheelbase Overall6 060 mm 19 ft 10 1 2 in Length Over beams8 875 mm 29 ft 1 3 8 in Width2 600 mm 8 ft 6 3 8 in Height3 650 mm 11 ft 11 3 4 in Adhesive weight30 t 30 long tons 33 short tons Empty weight37 84 t 37 24 long tons 41 71 short tons Service weight47 58 t 46 83 long tons 52 45 short tons Fuel capacity2 t 1 97 long tons 2 20 short tons Water cap 5 m3 1 100 imp gal 1 300 US gal Boiler No of heating tubes108No of smoke tubes32Boiler pressure14 kp cm2 1 37 MPa 199 psi Heating surface Firebox1 56 m2 16 8 sq ft Radiative7 36 m2 79 2 sq ft Evaporative72 00 m2 775 0 sq ft Superheater Heating area25 2 m2 271 sq ft Cylinders2Cylinder size420 mm 16 9 16 in Piston stroke500 mm 19 11 16 in Valve gearHeusingerParking brakecounterweight handbrakeCouplersEqualising lever coupler de Performance figuresMaximum speed50 km h 31 mph Indicated power400 kW 544 PS 536 hp Tractive effort Starting7 4 Mp 73 kN 7 3 LTf 8 2 STf 72 5 kN 16 300 lbf CareerNumbersNWE No 21II DR 99 6001 Contents 1 History 2 Technical features 3 References 4 External linksHistory editThe locomotive was the only unit to be built of a planned series of standard superheated steam locomotives with the axle arrangements 1 C1 1 D1 and 1 E1 that the Nordhausen Wernigerode Railway Company NWE the Gernrode Harzgerode Railway Company and the South Harz Railway Company had ordered from Friedrich Krupp AG for replacing their older less economic saturated steam engines In standardising their designs it was envisaged that as many parts of the locomotives as possible would be used across the whole range in the interests of economic production simplified spare part stock holdings and easier maintenance and servicing But because the development order was not given by the Deutsche Reichsbahn and because different construction conventions were followed in some cases these were not seen as Einheitsloks the standard locomotives produced by the DR between the wars As a result of the outbreak of World War II however only the prototyped of the 1 C1 version was built in 1939 by Krupp orders for the other engines were cancelled The prototype locomotive was accepted into service by the NWE as No 21 the second to carry that number and following the takeover of the NWE by the East German Deutsche Reichsbahn in 1949 was renumbered to 99 6001 In 1970 the loco was given the computer number 99 6001 4 In 1956 the engine was transferred initially temporarily from the Harz Railway to the Selke Valley Railway In 1961 this became permanent After the re joining of the two lines in 1983 1984 it was once again used for duties on the Harz Railway for example to head the first scheduled passenger train between Gernrode and Hasselfelde via Stiege on 3 June 1984 nbsp No 99 6001 in green nickname Laubfrosch tree frog Between 1991 and 1994 it did brief service in green livery as no 21 in charge of the heritage train Traditionszug a special made up of historic coaches which the Mallet locomotives to that point could not haul as their brakes were not compatible with the new compressed air brakes of the train In addition it carried out duties from its home station of Gernrode Technical features editIn designing and building the NWE 21II the firm of Krupp made extensive use of welding even for the boiler in contrast with the contemporary design approach of the Reichsbahn Einheitslokomotiven The three driven wheelsets are fixed firmly in a bar frame with a 70 mm side thickness Wangenstarke The two front and rear carrying axles are able to swing out radially and are housed in a Bissell truck The boiler is fed by two feedwater pumps The two outside cylinders which are slightly tilted to cope with the constraints of the rail gauge are driven by Heusinger valve gear with Kuhn slides The factory fitted Schulz piston valves were late replaced by Trofimoff piston valves These gave better running performance when the locomotive was free running Leerlauf and the regulator was closed because they practically relieve the cylinder of its job as an air pump when the steam pressure is released Together with the locomotives of Class 99 32 which were also permitted to run at up to 50 km h 31 mph the engine was one of the five narrow gauge locomotives in Germany with the highest top speed References editObermayer Horst J 1971 Taschenbuch Deutsche Schmalspur Dampflokomotiven Stuttgart Franckh ISBN 3 440 03818 1 Roper Hans Becker Helmut Dill Werner Zieglgansberger Gerhard 1992 Die Harzquer und Brockenbahn 3rd expanded ed Berlin Transpress Verlagsgesellschaft ISBN 3 344 70747 7 Weisbrod Manfred Wiegard Hans Muller Hans Petznick Wolfgang 1995 Deutsches Lok Archiv Dampflokomotiven 4 Baureihe 99 Berlin transpress pp 233 ff ISBN 3 344 70903 8 External links edit nbsp Wikimedia Commons has media related to NWE Nr 21 Data sheet at Freundeskreis Selketalbahn Retrieved from https en wikipedia org w index php title NWE No 21 amp oldid 1147241020, wikipedia, wiki, book, books, library,
