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

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Bavarian D IV DRG Class 88.70
Type and origin Build date 1867–1872 Total produced 12
Specifications Configuration: ​  • Whyte 0-4-0 Gauge 1,435 mm (4 ft 8+1⁄2 in) Length: ​  • Over beams 7,680 mm (25 ft 2+1⁄4 in) Axle load 12.0 or 13.8 t (11.8 or 13.6 long tons; 13.2 or 15.2 short tons) Adhesive weight 24.0 or 27.5 t (23.6 or 27.1 long tons; 26.5 or 30.3 short tons) Service weight 24.0 or 27.5 t (23.6 or 27.1 long tons; 26.5 or 30.3 short tons) Boiler pressure 7 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)  • Evaporative 72.5 or 65.5 m2 (780 or 705 sq ft) Cylinders Two Cylinder size 349 or 356 mm (13+3⁄4 or 14 in) Piston stroke 508 mm (20 in)
Performance figures Maximum speed 45 or 50 km/h (28 or 31 mph)
Career Numbers BOB: D1–D12 K.Bay.Sts.E.: 1178–1189 DRG: 88 7021– 88 7026 Retired mid-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

• Royal Bavarian State Railways
• List of Bavarian 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. 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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