DRG Class 84

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.

DRG Class 84
Number(s)DRG 84 001 – 84 012
Quantity12
Manufacturer
Year(s) of manufacture1935–1937
Retired1968
Wheel arrangement2-10-2T
Axle arrangement
  • 1′E1′ h3t
  • 1′E1′ h2t †
TypeGt 57.18
Track gauge1,435 mm (4 ft 8 1⁄2 in)
Length over buffers
  • 15,550 mm (51 ft 1⁄4 in)
  • 15,950 mm (52 ft 4 in) †
Minimum curve100 m (330 ft)
Empty weight100.5 tonnes (98.9 long tons; 110.8 short tons)
Service weight125.5 tonnes (123.5 long tons; 138.3 short tons)
Adhesive weight91.3 tonnes (89.9 long tons; 100.6 short tons)
Axle load18.3 tonnes (18.0 long tons; 20.2 short tons)
Top speed
  • 70 km/h (43 mph)
  • 80 km/h (50 mph) ‡
Indicated Power1,426 PS (1,050 kW; 1,410 hp)
Driving wheel diameter1,400 mm (4 ft 7 1⁄8 in)
Leading wheel diameter850 mm (2 ft 9 1⁄2 in)
Trailing wheel diameter850 mm (2 ft 9 1⁄2 in)
Valve gearHeusinger (Walschaerts)
No. of cylinders
  • Three
  • Two †
Cylinder bore
  • 480 mm (18 7⁄8 in)
  • 600 mm (23 5⁄8 in) †
  • 500 mm (19 11⁄16 in) ‡
Piston stroke660 mm (26 in)
Boiler Overpressure16 bar (1.60 MPa; 232 psi)
No. of heating tubes158
No. of smoke tubes48
Grate area3.76 m2 (40.5 sq ft)
Superheater area85.00 m2 (914.9 sq ft)
Evaporative heating area210.10 m2 (2,261.5 sq ft)
Water capacity14 m3 (490 cu ft) or 14,000 litres (3,100 imp gal; 3,700 US gal)
FuelCoal: 3 tonnes (3.0 long tons; 3.3 short tons)
Features84 003–004† with Luttermöller axles on the outer coupled axles

In the Second World War many 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
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