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

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Bavarian D X DRG Class 98.77
Type and origin Builder Krauss, Munich Build date 1890, 1893 Total produced 9
Specifications Configuration: ​  • Whyte 0-6-2T Gauge 1,435 mm (4 ft 8+1⁄2 in) Driver dia. 985 or 1,006 mm (3 ft 2+3⁄4 in or 3 ft 3+5⁄8 in) Trailing dia. 780 or 800 mm (2 ft 6+3⁄4 in or 2 ft 7+1⁄2 in) Length: ​  • Over beams 9,310 mm (30 ft 6+1⁄2 in) Axle load 11.0 t (10.8 long tons; 12.1 short tons) Adhesive weight 33.0 t (32.5 long tons; 36.4 short tons) Service weight 42.7 t (42.0 long tons; 47.1 short tons) Boiler pressure 12 kgf/cm2 (1,180 kPa; 171 lbf/in2) Heating surface:  • Firebox 1.40 m2 (15.1 sq ft)  • Evaporative 71.71 m2 (771.9 sq ft) Cylinders 2 Cylinder size 390 mm (15+3⁄8 in) Piston stroke 508 mm (20 in)
Performance figures Maximum speed 45 km/h (28 mph) Indicated power 300 PS (221 kW; 296 hp)
Career Numbers K.Bay.Sts.E: 931–935, 99, 1961–1963 DRG 98 7701 – 98 7709 Retired 1925–1931

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

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

References

• Weisbrod, Manfred; Petznik, Wolfgang (1981). Dampflokomotiven deutscher Eisenbahnen, Baureihe 97–99 (EFA 1.4) (in German) (2nd ed.). Düsseldorf: Alba. pp. 96–98. ISBN 3-87094-087-5.

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