The engines of DR Class 99.23 are metre gauge tank locomotives, that were procured by the Deutsche Reichsbahn (DR) in East Germany from 1954 to 1956. When they entered service they had operating numbers 99 231–99 247. Today they are numbered 99 7231–99 7247.
Quick Facts Type and origin, Power type ...
DR Class 99.23–24 |
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99 7243-1 in 2006 |
Type and origin |
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Power type | Steam |
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Builder | VEB Lokomotivbau "Karl Marx" Babelsberg |
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Serial number | 134008–134028 |
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Build date | 1954–1956 |
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Total produced | 21 |
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Specifications |
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Configuration:
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• Whyte | 2-10-2T |
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• UIC | 1′E1′ h2t |
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• German | K 57.10 |
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Gauge | 1,000 mm (3 ft 3+3⁄8 in) |
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Leading dia. | 0,500 mm (1 ft 7+5⁄8 in) |
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Driver dia. | 1,000 mm (3 ft 3+3⁄8 in) |
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Trailing dia. | 0,550 mm (1 ft 9+5⁄8 in) |
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Wheelbase: | |
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• Axle spacing (Asymmetrical) | - 1,950 mm (76+3⁄4 in) +
- 1,200 mm (47+1⁄4 in) +
- 1,200 mm (47+1⁄4 in) +
- 1,200 mm (47+1⁄4 in) +
- 1,200 mm (47+1⁄4 in) +
- 1,950 mm (76+3⁄4 in) =
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• Engine | 8,700 mm (342+1⁄2 in) |
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Length:
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• Over couplers | 11,730 mm (461+3⁄4 in) |
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• Over headstocks | 11,100 mm (437 in) |
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Width | 2,645 mm (8 ft 8+1⁄8 in) |
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Height | 3,650 mm (11 ft 11+11⁄16 in) |
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Axle load | 9.5 t (9.3 long tons; 10.5 short tons) |
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Adhesive weight | 47.5 t (46.7 long tons; 52.4 short tons) |
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Empty weight | 47.5 t (46.7 long tons; 52.4 short tons) |
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Service weight | 64.5 t (63.5 long tons; 71.1 short tons) |
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Fuel type | Coal |
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Fuel capacity | 4.0 t (3.9 long tons; 4.4 short tons) |
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Water cap. | 8.0 m3 (1,760 imp gal; 2,110 US gal) |
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Firebox: | |
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• Grate area | 2.8 m2 (30 sq ft) |
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Boiler:
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• Pitch | 2,500 mm (8 ft 2+3⁄8 in) |
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• Tube plates | 3,200 mm (10 ft 6 in) |
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• Small tubes | 44.5 mm (1+3⁄4 in), 114 off |
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• Large tubes | 121 mm (4+3⁄4 in), 32 off |
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Boiler pressure | 14 bar (14.3 kgf/cm2; 203 psi) |
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Feedwater heater | Mixer-preheater |
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Heating surface: | |
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• Firebox | 10.4 m2 (112 sq ft) |
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• Tubes | 49.7 m2 (535 sq ft) |
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• Flues | 35.4 m2 (381 sq ft) |
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• Total surface | 95.5 m2 (1,028 sq ft) |
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Superheater:
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• Heating area | 30.0 m2 (323 sq ft) |
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Cylinders | Two, outside |
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Cylinder size | 500 mm × 500 mm (19+11⁄16 in × 19+11⁄16 in) |
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Valve gear | Heusinger with Kuhn slides |
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Loco brake | Ke G-P mZ |
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Train brakes | Hardy vacuum brake, converted to Knorr compressed air brake |
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Couplers | Equalising lever coupler [de]; in Eisfeld: Janney |
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Performance figures |
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Maximum speed | 40 km/h (25 mph) |
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Indicated power | 700–750 PS (515–552 kW; 690–740 hp) |
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Tractive effort | 102.9 kN (23,100 lbf) |
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Career |
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Operators | |
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Numbers | DR: 99 231 – 99 247 from 1970: 99 7231 – 99 7247 |
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