NWE Nos. 11–22
Class 99.590 |
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99 5902 (left) and 99 5901 (right) at Wernigerode, 2014 |
| Type and origin |
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| Builder | Arnold Jung and Meckl. Masch.- u. Waggonbau AG Güstrow (MWG) |
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| Build date | 1897–1901 |
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| Total produced | 12 |
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| Specifications |
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| • German | K 44.9 |
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| Gauge | 1,000 mm (3 ft 3+3⁄8 in) metre gauge |
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| Driver dia. | 1,000 mm (39.37 in) |
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| Wheelbase: | |
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| • Bogie | 1,400 mm (55 in) |
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| • Overall | 4,600 mm (15 ft 1+1⁄8 in) |
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Length:
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| • Over beams | 8,875 mm (29 ft 1+3⁄8 in) |
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| Width | 2,600 mm (8 ft 6+3⁄8 in) |
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| Height | 3,900 mm (12 ft 9+1⁄2 in) |
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| Axle load | 8.5 t (8.4 long tons; 9.4 short tons) |
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| Adhesive weight | 34 t (33 long tons; 37 short tons) |
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| Empty weight | 28 t (28 long tons; 31 short tons) |
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| Service weight | 34 t (33 long tons; 37 short tons) |
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| Fuel capacity | 1.5 t (1.5 long tons; 1.7 short tons) coal |
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| Water cap. | 5 m3 (180 cu ft) |
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Boiler:
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| No. of heating tubes | 133 |
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| Boiler pressure | 14 bar (1.4 MPa; 200 psi) |
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| Heating surface: | |
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| • Firebox | 1.39 m2 (15.0 sq ft) |
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| • Radiative | 5.24 m2 (56.4 sq ft) |
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| • Evaporative | 61.34 m2 (660.3 sq ft) |
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| Cylinders | 4 |
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| High-pressure cylinder | 285 mm (11.22 in) |
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| Low-pressure cylinder | 425 mm (16.73 in) |
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| Piston stroke | 500 mm (19.69 in) |
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| Cylinder pressure | high pressure 14 bar (1.4 MPa; 200 psi),
low pressure 5 bar (500 kPa; 73 psi),
with starting valve (Anfahrventil) max 7 bar (700 kPa; 100 psi) |
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| Valve gear | Heusinger |
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| Parking brake | Counterweight handbrake |
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| Couplers | Equalising lever coupler |
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| Performance figures |
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| Maximum speed | 30 km/h (19 mph) |
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| Indicated power | 255 PS (188 kW; 252 hp) |
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Tractive effort:
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| • Starting | 55.79 kN (12,540 lbf) |
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| Career |
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| Numbers | NWE Nos. 11–22
99 5901–5905 |
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| Retired | see text |
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The Nordhausen-Wernigerode Railway Company incorporated twelve Mallet locomotives into its fleet as Numbers 11 to 22. In 1950 the remaining locomotives were renumbered as Class 99.590 by the Deutsche Reichsbahn.
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