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
Type and origin
Build date1867–1872
Total produced12
Specifications
Configuration:
​
 • Whyte0-4-0
Gauge1,435 mm (4 ft 8+1⁄2 in)
Length:
​
 • Over beams7,680 mm (25 ft 2+1⁄4 in)
Axle load12.0 or 13.8 t (11.8 or 13.6 long tons; 13.2 or 15.2 short tons)
Adhesive weight24.0 or 27.5 t (23.6 or 27.1 long tons; 26.5 or 30.3 short tons)
Service weight24.0 or 27.5 t (23.6 or 27.1 long tons; 26.5 or 30.3 short tons)
Boiler pressure7 or 8 kgf/cm2 (686 or 785 kPa; 99.6 or 114 lbf/in2)
Heating surface:
 • Firebox		1.05 or 1.10 m2 (11.3 or 11.8 sq ft)
 • Evaporative72.5 or 65.5 m2 (780 or 705 sq ft)
CylindersTwo
Cylinder size349 or 356 mm (13+3⁄4 or 14 in)
Piston stroke508 mm (20 in)
Performance figures
Maximum speed45 or 50 km/h (28 or 31 mph)
Career
Numbers
  • BOB: D1–D12
  • K.Bay.Sts.E.: 1178–1189
  • DRG: 88 7021– 88 7026
Retiredmid-1920s

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

References
    • Hütter, Ingo (2021). Die Dampflokomotiven der Baureihen 60 bis 91 der DRG, DRB, DB, und DR (in German). Werl: DGEG Medien. p. 297. ISBN 978-3-946594-21-5.
    • Weisbrod, Manfred; Petznik, Wolfgang (1981). Dampflokomotiven deutscher Eisenbahnen, Baureihe 97–99 (EFA 1.4) (in German) (2nd ed.). Düsseldorf: Alba. pp. 124–126. ISBN 3-87094-087-5.
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