DB Class 78.10

DB Class 78.10
Type and origin Power type Steam Rebuilder Krauss-Maffei Rebuild date 1951 Number rebuilt 2
Specifications Configuration: ​  • Whyte 4-6-4T  • UIC 2′C′2 h2t  • German Pt 37.17 Gauge 1,435 mm (4 ft 8+1⁄2 in) Leading dia. 1,000 mm (3 ft 3+3⁄8 in) Driver dia. 1,750 mm (5 ft 8+7⁄8 in) Trailing dia. 1,000 mm (3 ft 3+3⁄8 in) Wheelbase: ​  • Axle spacing (Asymmetrical) 2,200 mm (7 ft 2+5⁄8 in) + 1,570 mm (5 ft 1+3⁄4 in) + 1,880 mm (6 ft 2 in) + 2,700 mm (8 ft 10+1⁄4 in) + 2,920 mm (9 ft 6+15⁄16 in) + 2,800 mm (9 ft 2+1⁄4 in) =  • Engine 14,070 mm (46 ft 2 in) Length: ​  • Over headstocks 15,937 mm (52 ft 3+1⁄2 in)  • Over buffers 17,237 mm (56 ft 6+1⁄2 in) Height 4,550 mm (14 ft 11+1⁄8 in) Axle load 17.0 t (16.7 long tons; 18.7 short tons) Adhesive weight 51.1 t (50.3 long tons; 56.3 short tons) Empty weight 81.1 t (79.8 long tons; 89.4 short tons) Service weight 109.7 t (108.0 long tons; 120.9 short tons) Fuel type Coal Fuel capacity 5 t (4.9 long tons; 5.5 short tons) Water cap. 17 m3 (3,740 imp gal; 4,490 US gal) Firebox: ​  • Grate area 2.58 m2 (27.8 sq ft) Boiler: ​  • Tube plates 4,700 mm (15 ft 5 in)  • Small tubes  51 mm (2 in), 123 off  • Large tubes 133 mm (5+1⁄4 in), 26 off Boiler pressure 12 bar (12.2 kgf/cm2; 174 psi) Heating surface: ​  • Firebox  14.47 m2 (155.8 sq ft)  • Tubes  83.54 m2 (899.2 sq ft)  • Flues  47.99 m2 (516.6 sq ft)  • Total surface 146.00 m2 (1,571.5 sq ft) Superheater: ​  • Heating area  58.90 m2 (634.0 sq ft) Cylinders Two, outside Cylinder size 575 mm × 630 mm (22+5⁄8 in × 24+13⁄16 in) Valve gear Heusinger (Walschaerts) Train brakes Compressed-air brake
Performance figures Maximum speed 100 km/h (62 mph) Indicated power 1,180 PS (868 kW; 1,160 hp)
Career Operators Deutsche Bundesbahn Numbers 78 1001 – 78 1002 Retired 1961

The two German steam locomotives of DB Class 78.10, operated by the Deutsche Bundesbahn, were rebuilds based on two Prussian P 8 engines which were converted by the firm of Krauss-Maffei and the Minden repair shop. The aim was to improve the acceleration performance of the vehicles, especially for duties on suburban lines and city (Stadtbahn) lines.

The running gear, drive and boilers of both locomotives, which originally had the running numbers 38 2919 and 38 2990, remained virtually unchanged. The driver's cab was redesigned. A short tender was added which was coupled to the engine with a shaft and improved the riding qualities when running in reverse. The locomotives were classed as tank engines and initially worked in the Munich area, later in Augsburg and finally by Lake Constance. They remained the only ones of their type and were retired as early as 1961.

Neither of the two DB Class 78.10 locomotives has been preserved.

References

• Hütter, Ingo (2021). Die Dampflokomotiven der Baureihen 60 bis 91 der DRG, DRB, DB, und DR (in German). Werl: DGEG Medien. pp. 245–246. ISBN 978-3-946594-21-5.
• Weisbrod, Manfred; Müller, Hans; Petznik, Wolfgang (1978). Dampflokomotiven deutscher Eisenbahnen, Baureihe 60–96 (EFA 1.3) (in German) (4th ed.). Düsseldorf: Alba. pp. 91–92, 240. ISBN 3-87094-083-2.