DRG Class 84

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DRG Class 84
Works photograph of 84 0001
Type and origin Power type Steam 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  • UIC 1′E1′ h3t 1′E1′ h2t †  • German Gt 57.18 Gauge 1,435 mm (4 ft 8+1⁄2 in) Leading dia. 0,850 mm (2 ft 9+1⁄2 in) Driver dia. 1,400 mm (4 ft 7+1⁄8 in) Trailing dia. 0,850 mm (2 ft 9+1⁄2 in) Minimum curve 100 m (330 ft) Wheelbase: ​  • Axle spacing (Asymmetrical)  2,550 mm (8 ft 4+3⁄8 in) +  1,650 mm (5 ft 5 in) +  1,650 mm (5 ft 5 in) +  1,650 mm (5 ft 5 in) +  1,650 mm (5 ft 5 in) +  2,250 mm (7 ft 4+5⁄8 in) = 11,700 mm (38 ft 4+5⁄8 in)  2,692 mm (8 ft 10 in) + †  1,708 mm (5 ft 7+1⁄4 in) +  1,700 mm (5 ft 6+7⁄8 in) +  1,700 mm (5 ft 6+7⁄8 in) +  1,708 mm (5 ft 7+1⁄4 in) +  2,692 mm (8 ft 10 in) = 12,200 mm (40 ft 3⁄8 in) † Length: ​  • Over headstocks 14,250 mm (46 ft 9 in) 14,650 mm (48 ft 3⁄4 in) †  • Over buffers 15,550 mm (51 ft 1⁄4 in) 15,950 mm (52 ft 4 in) † Height 4,550 mm (14 ft 11+1⁄8 in) Axle load 18.3 t (18.0 long tons; 20.2 short tons) 18.0 t (17.7 long tons; 19.8 short tons) † Adhesive weight 91.3 t (89.9 long tons; 100.6 short tons) 89.7 t (88.3 long tons; 98.9 short tons) † Empty weight 100.5 t (98.9 long tons; 110.8 short tons) 100.9 t (99.3 long tons; 111.2 short tons) † Service weight 125.5 t (123.5 long tons; 138.3 short tons) 125.2 t (123.2 long tons; 138.0 short tons) † Fuel type Coal Fuel capacity 3 tonnes (3.0 long tons; 3.3 short tons) Water cap. 14 m3 (3,080 imp gal; 3,700 US gal) Firebox: ​  • Grate area 3.76 m2 (40.5 sq ft) Boiler: ​  • Pitch 3,100 mm (10 ft 2 in)  • Tube plates 4,700 mm (15 ft 5 in)  • Small tubes  51 mm (2 in), 158 off  • Large tubes 133 mm (5+1⁄4 in), 48 off Boiler pressure 20 bar (20.4 kgf/cm2; 290 psi) 16 bar (16.3 kgf/cm2; 232 psi) ‡ Heating surface: ​  • Firebox  14.2 m2 (153 sq ft)  • Tubes 107.3 m2 (1,155 sq ft)  • Flues  88.6 m2 (954 sq ft)  • Total surface 210.1 m2 (2,261 sq ft) Superheater: ​  • Heating area  85.0 m2 (915 sq ft) Cylinders Three Two, outside † Cylinder size 480 mm × 660 mm (18+7⁄8 in × 26 in) 600 mm × 660 mm (23+5⁄8 in × 26 in) † 500 mm × 660 mm (19+11⁄16 in × 26 in) ‡ Valve gear Heusinger (Walschaerts)
Performance figures Maximum speed 70 km/h (43 mph) 80 km/h (50 mph) ‡ Indicated power 1,425 PS (1,050 kW; 1,410 hp)
Career Operators Deutsche Reichsbahn Numbers 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 Berliner Maschinenbau and Orenstein & Koppel. One feature was that they were Berliner-built locomotives were fitted with Schwartzkopff-Eckhardt II bogies, while the O&K-built had Luttermöller 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.

The entire class was withdrawn between 1966 and 1968 apart from one, and all were scrapped.

• List of DRG locomotives and railbuses

• Hütter, Ingo (2021). Die Dampflokomotiven der Baureihen 60 bis 91 der DRG, DRB, DB, und DR (in German). Werl: DGEG Medien. pp. 262–265. ISBN 978-3-946594-21-5.
• Weisbrod, Manfred; Müller, Hans; Petznik, Wolfgang (1978). Dampflokomotiven deutscher Eisenbahnen, Baureihe 60–96 (EFA 1.3) (in German) (4th ed.). Düsseldorf: Alba. pp. 109–113, 241–242. ISBN 3-87094-083-2.

• Einheitslok Baureihe 84 Müglitztalbahn