DR Class 99.77-79

Specifications
Specifications
Configuration:;
• Whyte	2-10-2T
• German	K 57.9
Gauge	750 mm (2 ft 5+1⁄2 in)
Driver dia.	800 mm (2 ft 7+1⁄2 in)
Carrying wheel diameter	550 mm (1 ft 9+5⁄8 in)
Wheelbase:
• Overall	7,600 mm (24 ft 11+1⁄4 in)
Length:;
• Over couplers	11,300 mm (37 ft 1 in)
Height	3,550 mm (11 ft 7+3⁄4 in)
Axle load	9.0 tonnes (8.9 long tons; 9.9 short tons)
Adhesive weight	45.0 tonnes (44.3 long tons; 49.6 short tons)
Empty weight	44.0 tonnes (43.3 long tons; 48.5 short tons)
Service weight	58.0 tonnes (57.1 long tons; 63.9 short tons)
Fuel capacity	Coal: 3.6 tonnes (3.5 long tons; 4.0 short tons)
Water cap.	5.8 m3 (200 cu ft) or 5,800 litres (1,300 imp gal; 1,500 US gal)
Boiler:;
No. of heating tubes	92
No. of smoke tubes	28
Heating tube length	3,200 mm (10 ft 6 in)
Boiler pressure	14 bar (1.40 MPa; 203 psi)
Heating surface:
• Firebox	2.57 m2 (27.7 sq ft)
• Radiative	8.50 m2 (91.5 sq ft)
• Tubes	68.4 m2 (736 sq ft)
• Evaporative	76.10 m2 (819.1 sq ft)
Superheater:;
• Heating area	27.00 m2 (290.6 sq ft)
Cylinders	Two, outside
Cylinder size	400 mm (15+3⁄4 in)
Piston stroke	450 mm (17+11⁄16 in)
Valve gear	Heusinger
Train brakes	Hardy vacuum brake,; Heberlein brake no longer provided

Type and origin
Type and origin
Builder	VEB Lokomotivbau Karl Marx, Babelsberg
Build date	1952–1956
Total produced	26

Class 99.77–79
Class 99.77–79
Builder
Type and origin
Builder	VEB Lokomotivbau Karl Marx, Babelsberg
Build date	1952–1956
Total produced	26
Configuration:;
Specifications
Configuration:;
• Whyte	2-10-2T
• German	K 57.9
Gauge	750 mm (2 ft 5+1⁄2 in)
Driver dia.	800 mm (2 ft 7+1⁄2 in)
Carrying wheel diameter	550 mm (1 ft 9+5⁄8 in)
Wheelbase:
• Overall	7,600 mm (24 ft 11+1⁄4 in)
Length:;
• Over couplers	11,300 mm (37 ft 1 in)
Height	3,550 mm (11 ft 7+3⁄4 in)
Axle load	9.0 tonnes (8.9 long tons; 9.9 short tons)
Adhesive weight	45.0 tonnes (44.3 long tons; 49.6 short tons)
Empty weight	44.0 tonnes (43.3 long tons; 48.5 short tons)
Service weight	58.0 tonnes (57.1 long tons; 63.9 short tons)
Fuel capacity	Coal: 3.6 tonnes (3.5 long tons; 4.0 short tons)
Water cap.	5.8 m3 (200 cu ft) or 5,800 litres (1,300 imp gal; 1,500 US gal)
Boiler:;
No. of heating tubes	92
No. of smoke tubes	28
Heating tube length	3,200 mm (10 ft 6 in)
Boiler pressure	14 bar (1.40 MPa; 203 psi)
Heating surface:
• Firebox	2.57 m2 (27.7 sq ft)
• Radiative	8.50 m2 (91.5 sq ft)
• Tubes	68.4 m2 (736 sq ft)
• Evaporative	76.10 m2 (819.1 sq ft)
Superheater:;
• Heating area	27.00 m2 (290.6 sq ft)
Cylinders	Two, outside
Cylinder size	400 mm (15+3⁄4 in)
Piston stroke	450 mm (17+11⁄16 in)
Valve gear	Heusinger
Train brakes	Hardy vacuum brake,; Heberlein brake no longer provided
Maximum speed
Performance figures
Maximum speed	30 km/h (19 mph)
Indicated power	441 kW (600 PS; 591 hp)
Tractive effort:;
• Starting	83.35 kN (18,740 lbf)
Numbers
Career
Numbers	99 771 – 99 794; from 1970: 99 1771 – 99 1794
Retired	from 1976

The steam locomotives of DR Class 99.77–79 were ordered by the Deutsche Reichsbahn in East Germany after the Second World War. They were narrow gauge locomotives with a 750 mm rail gauge and were built for the narrow gauge lines in Saxony. The locomotives were largely identical to the DRG Class 99.73–76 standard locomotives (Einheitslokomotiven) built in the 1930s. To differentiate them from their predecessors they were described as Neubaulokomotiven or newly designed engines.

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