DRG Class 71.0
The German DRG Class 71.0 was a four-coupled tank 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 | |
|---|---|
| Number(s) | DRG 71 001–006 |
| Quantity | 6 |
| Manufacturer | Schwartzkopff, Borsig, Krupp |
| Year(s) of manufacture | 1934–1936 |
| Retired | 1956 |
| Wheel arrangement | 2-4-2T |
| Axle arrangement | 1′B1′ h2t |
| Type | Pt 24.15 |
| Track gauge | 1,435 mm (4 ft 8 1⁄2 in) |
| Length over buffers | 11,800 mm (38 ft 8 1⁄2 in) |
| Height | 4,165 mm (13 ft 8 in) |
| Wheelbase | 3,000 mm (9 ft 10 in) |
| Overall wheelbase | 8,400 mm (27 ft 6 3⁄4 in) |
| Service weight | 58.6 t (57.7 long tons; 64.6 short tons) |
| Adhesive weight | 30.0 t (29.5 long tons; 33.1 short tons) |
| Axle load | 15.0 t (14.8 long tons; 16.5 short tons) |
| Top speed | 90 km/h (56 mph) |
| Indicated Power | 419 kW (570 PS; 562 hp) |
| Driving wheel diameter | 1,600 mm (63 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 | Walschaerts (Heusinger) |
| No. of cylinders | 2 |
| Cylinder bore | 330 mm (13 in) |
| Piston stroke | 660 mm (26 in) |
| Boiler Overpressure | 20 bar (2.00 MPa; 290 psi) |
| No. of heating tubes | 70 |
| No. of smoke tubes | 26 |
| Heating tube length | 3,500 mm (11 ft 5 3⁄4 in) |
| Grate area | 1.38 m2 (14.9 sq ft) |
| Superheater area | 28.60 m2 (307.8 sq ft) |
| Evaporative heating area | 67.74 m2 (729.1 sq ft) |
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.