DRG Class 71.0

The German DRG Class 71.0 was a 2-4-2T locomotive with the Deutsche Reichsbahn, which was intended as a replacement for railbuses. Originally it had been planned for these standard engines (Einheitsloks) to haul fast passenger trains.

DRG Class 71.0
Type and origin Power type Steam Builder Berliner Maschinenbau (2) Borsig (2) Krupp (2) Build date 1934–1936 Total produced 6
Specifications Configuration: ​  • Whyte 2-4-2T  • UIC 1′B1′ h2t  • German Pt 24.15 Gauge 1,435 mm (4 ft 8+1⁄2 in) Leading dia. 850 mm (2 ft 9+1⁄2 in) Driver dia. 001–002: 1,500 mm (4 ft 11 in) 003–006: 1,600 mm (5 ft 3 in) Trailing dia. 850 mm (2 ft 9+1⁄2 in) Wheelbase: ​  • Axle spacing (Asymmetrical) 2,700 mm (8 ft 10+1⁄4 in) + 3,000 mm (9 ft 10+1⁄8 in) + 2,700 mm (8 ft 10+1⁄4 in) =  • Engine 8,400 mm (27 ft 6+3⁄4 in) Length: ​  • Over headstocks 10,500 mm (34 ft 5+3⁄8 in)  • Over buffers 11,800 mm (38 ft 8+5⁄8 in) Height 4,165 mm (13 ft 8 in) Axle load 15.0 t (14.8 long tons; 16.5 short tons) Adhesive weight 001–002: 29.9 t (29.4 long tons; 33.0 short tons) 003–006: 30.0 t (29.5 long tons; 33.1 short tons) Empty weight 001–002: 45.4 t (44.7 long tons; 50.0 short tons) 003–006: 45.62 t (44.90 long tons; 50.29 short tons) Service weight 001–002: 48.6 t (47.8 long tons; 53.6 short tons) 003–006: 58.61 t (57.68 long tons; 64.61 short tons) Fuel type Coal Fuel capacity 001–002: 3.0 t (3.0 long tons; 3.3 short tons) 003–006: 2.8 t (2.8 long tons; 3.1 short tons) Water cap. 7 m3 (1,500 imp gal; 1,800 US gal) Firebox: ​  • Grate area 001–002: 1.37 m2 (14.7 sq ft) 003–006: 1.38 m2 (14.9 sq ft) Boiler: ​  • Pitch 2,900 mm (9 ft 6+1⁄8 in)  • Tube plates 3,500 mm (11 ft 5+3⁄4 in)  • Small tubes  44.5 mm (1+3⁄4 in), 70 off  • Large tubes 118 mm (4+5⁄8 in), 26 off Boiler pressure 20 bar (20.4 kgf/cm2; 290 psi) Heating surface: ​  • Firebox 001–002: 5.53 m2 (59.5 sq ft) 003–006: 5.89 m2 (63.4 sq ft)  • Tubes 30.4 m2 (327 sq ft)  • Flues 31.5 m2 (339 sq ft)  • Total surface 001–002: 67.43 m2 (725.8 sq ft) 003–006: 67.79 m2 (729.7 sq ft) Superheater: ​  • Heating area 28.6 m2 (308 sq ft) Cylinders Two, outside Cylinder size 001–002: 310 mm × 660 mm (12+3⁄16 in × 26 in) 003–006: 330 mm × 660 mm (13 in × 26 in) Valve gear Heusinger (Walschaerts)
Performance figures Maximum speed 001–002: 90 km/h (56 mph) 003–006: 100 km/h (62 mph) Indicated power 570 PS (419 kW; 562 hp)
Career Operators Deutsche Reichsbahn → Deutsche Bundesbahn Numbers 71 001 – 71 006 Retired 1955–1956

Two vehicles were delivered in 1934 by the firm of Schwartzkopff and two each in 1936 by the firms of Borsig and Krupp. The two-cylinder superheated engines were equipped with automatic underfeed stokers for one-man operation. In the course of its service the boiler overpressure was reduced from 20 bar to 16 bar for safety reasons. All the locomotives had a plate frame. The second coupled wheelset was driven and the carrying wheels rested in Bissel axles.

The Deutsche Bundesbahn took over all the engines after the Second World War and allocated them to the locomotive depot (Bahnbetriebswerk or Bw) in Nuremberg. Later they were all transferred to Kaiserslautern and Landau. The locomotives were retired by 1956.

No examples of the DRG Class 71.0 remain.

See also

• List of DRG locomotives and railbuses

References

• Hütter, Ingo (2021). Die Dampflokomotiven der Baureihen 60 bis 91 der DRG, DRB, DB, und DR (in German). Werl: DGEG Medien. pp. 68–69. 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. 45–48, 230–231. ISBN 3-87094-083-2.

External links

• Locomotive drawing and data