| DRG Class 99.73-76 |
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99 731 in August 2007 |
| Type and origin |
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| Power type | Steam |
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| Builder | |
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| Build date | 1928–1929, 1933 |
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| Total produced | 32 |
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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 57.9 |
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| Gauge | 750 mm (2 ft 5+1⁄2 in) |
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| Leading dia. | 550 mm (1 ft 9+5⁄8 in) |
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| Driver dia. | 800 mm (2 ft 7+1⁄2 in) |
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| Trailing dia. | 550 mm (1 ft 9+5⁄8 in) |
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| Wheelbase: | |
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• Axle spacing
(Asymmetrical) | - 1,800 mm (5 ft 10+7⁄8 in) +
- 1,000 mm (3 ft 3+3⁄8 in) +
- 1,000 mm (3 ft 3+3⁄8 in) +
- 1,000 mm (3 ft 3+3⁄8 in) +
- 1,000 mm (3 ft 3+3⁄8 in) +
- 1,800 mm (5 ft 10+7⁄8 in) =
|
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| • Engine | 7,600 mm (24 ft 11+1⁄4 in) |
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Length:
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| • Over couplers | 10,540 mm (34 ft 7 in) |
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| Height | 3,570 mm (11 ft 8+9⁄16 in) |
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| Axle load | 9.2 t (9.1 long tons; 10.1 short tons) |
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| Adhesive weight | 46.1 t (45.4 long tons; 50.8 short tons) |
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| Empty weight | 44.3 t (43.6 long tons; 48.8 short tons) |
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| Service weight | 56.7 t (55.8 long tons; 62.5 short tons) |
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| Fuel type | Coal |
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| Fuel capacity | 2.5 t (2.5 long tons; 2.8 short tons) |
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| Water cap. | 5.8 m3 (1,280 imp gal; 1,530 US gal) |
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| Firebox: | |
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| • Grate area | 1.74 m2 (18.7 sq ft) |
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Boiler:
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| • Pitch | 2,100 mm (6 ft 10+5⁄8 in) |
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| • Tube plates | 3,500 mm (137+3⁄4 in) |
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| • Small tubes | 44.5 mm (1+3⁄4 in), 92 off |
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| • Large tubes | 118 mm (4+5⁄8 in), 28 off |
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| Boiler pressure | 14 kgf/cm2 (13.7 bar; 199 psi) |
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| Heating surface: | |
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| • Firebox | 6.9 m2 (74 sq ft) |
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| • Tubes | 39.9 m2 (429 sq ft) |
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| • Flues | 33.7 m2 (363 sq ft) |
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| • Total surface | 80.3 m2 (864 sq ft) |
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Superheater:
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| • Heating area | 29.0 m2 (312 sq ft) |
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| Cylinders | Two, outside |
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| Cylinder size | 450 mm × 400 mm (17+11⁄16 in × 15+3⁄4 in) |
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| Valve gear | Heusinger (Walschaerts) |
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| Train brakes | Körting vacuum brake
Heberlein brake initially |
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| Couplers | Scharfenberg couplers |
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|
| Performance figures |
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| Maximum speed | 30 km/h (19 mph) |
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| Indicated power | 600–750 PS (441–552 kW; 592–740 hp) |
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| Tractive effort | 83.35 kN (18,740 lbf) |
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| Career |
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| Operators | |
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| Numbers | DRG/DR: 99 731 – 99 762
DR from 1970: 99 1731 – 99 1762 |
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| Retired | from 1945 |
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The German Class 99.73-76 engines were standard locomotives (Einheitslokomotiven) in service with the Deutsche Reichsbahn for Saxony's narrow gauge railways. Together with their follow-on class, the DR Class 99.77-79, they were the most powerful narrow gauge locomotives in Germany for the 750 mm (2 ft 5+1⁄2 in) track gauge.
