DRG Class 99.73–76

Specifications
Specifications
Configuration:;
• Whyte	2-10-2T
• German	K 57.9
Gauge	750 mm (2 ft 5+1⁄2 in)
Driver dia.	800 mm (31+1⁄2 in)
Carrying wheel diameter	550 mm (21+5⁄8 in)
Wheelbase:
• Overall	7,600 mm (24 ft 11+1⁄4 in)
Length:;
• Over couplers	10,540 mm (34 ft 7 in)
Height	3,550 mm (11 ft 7+3⁄4 in)
Adhesive weight	46.1 t (45.4 long tons; 50.8 short tons)
Service weight	56.7 t (55.8 long tons; 62.5 short tons)
Fuel capacity	Coal: 2.5 t (2.5 long tons; 2.8 short tons)
Water cap.	5.8 m3 (200 cu ft) or 5,800 litres (1,300 imp gal; 1,500 US gal)
Boiler pressure	14 kgf/cm2 (1,370 kPa; 199 psi)
Heating surface:
• Firebox	1.74 m2 (18.7 sq ft)
• Radiative	6.70 m2 (72.1 sq ft)
• Tubes	73.60 m2 (792.2 sq ft)
• Evaporative	80.30 m2 (864.3 sq ft)
Superheater:;
• Heating area	9.00 m2 (96.9 sq ft)
Cylinders	Two, outside
Cylinder size	400 mm (15+3⁄4 in)
Piston stroke	450 mm (17+11⁄16 in)
Valve gear	Walschaerts (Heusinger)
Train brakes	Körting vacuum brake; Heberlein brake initially
Couplers	Scharfenberg couplers

Type and origin
Type and origin
Builder	Sächsische Maschinenfabrik (13); Berliner Maschinenbau (19);
Build date	1928–1929, 1933
Total produced	32

Class 99.73-76
Class 99.73-76
Builder
Type and origin
Builder	Sächsische Maschinenfabrik (13); Berliner Maschinenbau (19);
Build date	1928–1929, 1933
Total produced	32
Configuration:;
Specifications
Configuration:;
• Whyte	2-10-2T
• German	K 57.9
Gauge	750 mm (2 ft 5+1⁄2 in)
Driver dia.	800 mm (31+1⁄2 in)
Carrying wheel diameter	550 mm (21+5⁄8 in)
Wheelbase:
• Overall	7,600 mm (24 ft 11+1⁄4 in)
Length:;
• Over couplers	10,540 mm (34 ft 7 in)
Height	3,550 mm (11 ft 7+3⁄4 in)
Adhesive weight	46.1 t (45.4 long tons; 50.8 short tons)
Service weight	56.7 t (55.8 long tons; 62.5 short tons)
Fuel capacity	Coal: 2.5 t (2.5 long tons; 2.8 short tons)
Water cap.	5.8 m3 (200 cu ft) or 5,800 litres (1,300 imp gal; 1,500 US gal)
Boiler pressure	14 kgf/cm2 (1,370 kPa; 199 psi)
Heating surface:
• Firebox	1.74 m2 (18.7 sq ft)
• Radiative	6.70 m2 (72.1 sq ft)
• Tubes	73.60 m2 (792.2 sq ft)
• Evaporative	80.30 m2 (864.3 sq ft)
Superheater:;
• Heating area	9.00 m2 (96.9 sq ft)
Cylinders	Two, outside
Cylinder size	400 mm (15+3⁄4 in)
Piston stroke	450 mm (17+11⁄16 in)
Valve gear	Walschaerts (Heusinger)
Train brakes	Körting vacuum brake; Heberlein brake initially
Couplers	Scharfenberg couplers
Maximum speed
Performance figures
Maximum speed	30 km/h (19 mph)
Indicated power	600–750 PS (441–552 kW; 592–740 hp)
Tractive effort:;
• Starting	83.35 kN (18,740 lbf)
Numbers
Career
Numbers	DRG/DR: 99 731 – 99 762; DR from 1970: 99 1731 – 99 1762
Retired	from 1945

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.

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