Bavarian D X

The Bavarian Class D X engines were saturated steam locomotives of the Royal Bavarian State Railways (Königlich Bayerische Staatsbahn).

Bavarian D X
DRG Class 98.77
Number(s)
  • K.Bay.Sts.E: 931–935, 99, 1961–1963
  • DRG 98 7701 – 98 7709
Quantity9
ManufacturerKrauss, Munich
Year(s) of manufacture1890, 1893
Retired1925–1931
Wheel arrangement0-6-2T
Axle arrangementC1′ n2t
Track gauge1,435 mm (4 ft 8 1⁄2 in)
Length over buffers9,310 mm (30 ft 6 1⁄2 in)
Service weight42.7 t (42.0 long tons; 47.1 short tons)
Adhesive weight33.0 t (32.5 long tons; 36.4 short tons)
Axle load11.0 t (10.8 long tons; 12.1 short tons)
Top speed45 km/h (28 mph)
Indicated Power300 PS (221 kW; 296 hp)
Driving wheel diameter985 or 1,006 mm (3 ft 2 3⁄4 in or 3 ft 3 5⁄8 in)
Trailing wheel diameter780 or 800 mm (2 ft 6 3⁄4 in or 2 ft 7 1⁄2 in)
No. of cylinders2
Cylinder bore390 mm (15 3⁄8 in)
Piston stroke508 mm (20 in)
Boiler Overpressure12 kgf/cm2 (1,180 kPa; 171 lbf/in2)
Grate area1.40 m2 (15.1 sq ft)
Evaporative heating area71.71 m2 (771.9 sq ft)
Locomotive brakesHardy vacuum brakes, later compressed-air brakes

The locomotives, which were built by Krauss were similar to the Class D VIII, but were smaller and lighter. Like the D VIII they had a trailing axle, that was connected to the final coupled axle by a Krauss-Helmholtz bogie.

In 1890 the first six were built, followed in 1893 by three more with somewhat larger wheels. The first engine was only 8,880 mm long due to the lack of a coal bunker on the driver's cab.

All the vehicles were taken over by the Deutsche Reichsbahn-Gesellschaft in 1925 as DRG Class 98.77 and remained in service until 1931. Only numbers 98 7706 and 98 7707 were retired shortly after the renumbering.

See also
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