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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.
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