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
Quantity	12
Manufacturer	84 001–002: Berliner Maschinenbau 84 003–004: Orenstein & Koppel † 84 005–012: Berliner Maschinenbau ‡
Year(s) of manufacture	1935–1937
Retired	1968
Wheel arrangement	2-10-2T
Axle arrangement	1′E1′ h3t 1′E1′ h2t †
Type	Gt 57.18
Track gauge	1,435 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 curve	100 m (330 ft)
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)
Adhesive weight	91.3 tonnes (89.9 long tons; 100.6 short tons)
Axle load	18.3 tonnes (18.0 long tons; 20.2 short tons)
Top speed	70 km/h (43 mph) 80 km/h (50 mph) ‡
Indicated Power	1,426 PS (1,050 kW; 1,410 hp)
Driving wheel diameter	1,400 mm (4 ft 7 ^1⁄8 in)
Leading wheel diameter	850 mm (2 ft 9 ^1⁄2 in)
Trailing wheel diameter	850 mm (2 ft 9 ^1⁄2 in)
Valve gear	Heusinger (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 stroke	660 mm (26 in)
Boiler Overpressure	16 bar (1.60 MPa; 232 psi)
No. of heating tubes	158
No. of smoke tubes	48
Grate area	3.76 m^2 (40.5 sq ft)
Superheater area	85.00 m^2 (914.9 sq ft)
Evaporative heating area	210.10 m^2 (2,261.5 sq ft)
Water capacity	14 m^3 (490 cu ft) or 14,000 litres (3,100 imp gal; 3,700 US gal)
Fuel	Coal: 3 tonnes (3.0 long tons; 3.3 short tons)
Features	84 003–004† 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

External links

• Einheitslok Baureihe 84 Müglitztalbahn