Bavarian D IV (Ostbahn)

The Bavarian Class D IV was a German steam locomotive with the Bavarian Eastern Railway (Bayrische Ostbahn).

Bavarian D IV
DRG Class 88.70
Number(s)
  • BOB: D1–D12
  • K.Bay.Sts.E.: 1178–1189
  • DRG: 88 7021– 88 7026
Quantity12
Year(s) of manufacture1867–1872
Retiredmid-1920s
Wheel arrangement0-4-0
Axle arrangementB n2t
Track gauge1,435 mm (4 ft 8 1⁄2 in)
Length over buffers7,680 mm (25 ft 2 1⁄4 in)
Service weight24.0 or 27.5 t (23.6 or 27.1 long tons; 26.5 or 30.3 short tons)
Adhesive weight24.0 or 27.5 t (23.6 or 27.1 long tons; 26.5 or 30.3 short tons)
Axle load12.0 or 13.8 t (11.8 or 13.6 long tons; 13.2 or 15.2 short tons)
Top speed45 or 50 km/h (28 or 31 mph)
No. of cylindersTwo
Cylinder bore349 or 356 mm (13 3⁄4 or 14 in)
Piston stroke508 mm (20 in)
Boiler Overpressure7 or 8 kgf/cm2 (686 or 785 kPa; 99.6 or 114 lbf/in2)
Grate area1.05 or 1.10 m2 (11.3 or 11.8 sq ft)
Evaporative heating area72.5 or 65.5 m2 (780 or 705 sq ft)

These engines had inside frames and Allan valve gear and were delivered in three series, that differed from one another in their dimensions. The original classification D was adopted by the Royal Bavarian State Railways (Königlich Bayerische Staatsbahn) and amended to D IV. Initially all the engines were taken over by the Deutsche Reichsbahn. However, only six vehicles were given running numbers (88 7021–7026). By the late 1920s they were all either retired or sold.

See also
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