DRG Class 84

DRG Class 84
Type and origin Builder 84 001–002: Berliner Maschinenbau 84 003–004: Orenstein & Koppel † 84 005–012: Berliner Maschinenbau ‡ Build date 1935–1937 Total produced 12
Specifications Configuration: ​  • Whyte 2-10-2T  • German Gt 57.18 Gauge 1,435 mm (4 ft 8+1⁄2 in) Leading dia. 850 mm (2 ft 9+1⁄2 in) Driver dia. 1,400 mm (4 ft 7+1⁄8 in) Trailing dia. 850 mm (2 ft 9+1⁄2 in) Minimum curve 100 m (330 ft) Length: ​  • Over buffers 15,550 mm (51 ft 1⁄4 in) 15,950 mm (52 ft 4 in) † Axle load 18.3 tonnes (18.0 long tons; 20.2 short tons) Adhesive weight 91.3 tonnes (89.9 long tons; 100.6 short tons) Empty weight 100.5 tonnes (98.9 long tons; 110.8 short tons) Service weight 125.5 tonnes (123.5 long tons; 138.3 short tons) Fuel capacity Coal: 3 tonnes (3.0 long tons; 3.3 short tons) Water cap. 14 m3 (490 cu ft) or 14,000 litres (3,100 imp gal; 3,700 US gal) Firebox: ​  • Grate area 3.76 m2 (40.5 sq ft) Boiler: ​  • Small tubes 158  • Large tubes 48 Boiler pressure 16 bar (1.60 MPa; 232 psi) Heating surface 210.10 m2 (2,261.5 sq ft) Superheater: ​  • Heating area 85.00 m2 (914.9 sq ft) Cylinders Three Two † Cylinder size 480 mm (18+7⁄8 in) 600 mm (23+5⁄8 in) † 500 mm (19+11⁄16 in) ‡ Piston stroke 660 mm (26 in) Valve gear Heusinger (Walschaerts)
Performance figures Maximum speed 70 km/h (43 mph) 80 km/h (50 mph) ‡ Indicated power 1,426 PS (1,050 kW; 1,410 hp)
Career Numbers DRG 84 001 – 84 012 Retired 1968

The German DRG Class 84s were standard (see Einheitsdampflokomotive) goods train tank locomotives with the Deutsche Reichsbahn. A total of twelve engines were placed into service by the Reichsbahn between 1935 and 1937. The machines were given operating numbers 84 001–012. They were worked on the Müglitz Valley Railway (Müglitztalbahn) between Heidenau and Altenberg in the Ore Mountains (Erzgebirge), for which they were specially designed to negotiate tight curves. They were manufactured by the firms of Schwartzkopff and Orenstein & Koppel. One feature was that they were fitted with Schwartzkopff-Eckhardt II bogies.

In the Second World War a large number of the engines were damaged and had to be sidelined as a result. The vehicles were taken over by the DR in East Germany after the war. The engines were mainly used between Schwarzenberg and Johanngeorgenstadt.

Between 1966 and 1968 all the Class 84 engines were retired apart from one. None, however, has survived.

See also

• List of DRG locomotives and railbuses

External links

• Einheitslok Baureihe 84 Müglitztalbahn