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
Quantity	12
Year(s) of manufacture	1867–1872
Retired	mid-1920s
Wheel arrangement	0-4-0
Axle arrangement	B n2t
Track gauge	1,435 mm (4 ft 8 ^1⁄2 in)
Length over buffers	7,680 mm (25 ft 2 ^1⁄4 in)
Service weight	24.0 or 27.5 t (23.6 or 27.1 long tons; 26.5 or 30.3 short tons)
Adhesive weight	24.0 or 27.5 t (23.6 or 27.1 long tons; 26.5 or 30.3 short tons)
Axle load	12.0 or 13.8 t (11.8 or 13.6 long tons; 13.2 or 15.2 short tons)
Top speed	45 or 50 km/h (28 or 31 mph)
No. of cylinders	Two
Cylinder bore	349 or 356 mm (13 ^3⁄4 or 14 in)
Piston stroke	508 mm (20 in)
Boiler Overpressure	7 or 8 kgf/cm^2 (686 or 785 kPa; 99.6 or 114 lbf/in^2)
Grate area	1.05 or 1.10 m^2 (11.3 or 11.8 sq ft)
Evaporative heating area	72.5 or 65.5 m^2 (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

• Royal Bavarian State Railways
• List of Bavarian locomotives and railbuses