DB Class 78.10

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.

DB Class 78.10
Type and origin
BuilderKrauss-Maffei
Build date1951
Total produced2
Specifications
Configuration:
​
 • Whyte4-6-4T
Gauge1,435 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:
 • Overall		14,070 mm (46 ft 2 in)
Length:
​
 • Over beams17,237 mm (56 ft 6+1⁄2 in)
Height4,550 mm (14 ft 11+1⁄8 in)
Axle load17.3 tonnes (17.0 long tons; 19.1 short tons)
Adhesive weight51.1 tonnes (50.3 long tons; 56.3 short tons)
Empty weight81 tonnes (80 long tons; 89 short tons)
Service weight110.0 tonnes (108.3 long tons; 121.3 short tons)
Fuel capacity5 tonnes (4.9 long tons; 5.5 short tons)
Water cap.17 m3 (600 cu ft) or 17,000 litres (3,700 imp gal; 4,500 US gal)
Boiler:
​
No. of heating tubes123
No. of smoke tubes26
Heating tube length4,700 mm (15 ft 5 in)
Boiler pressure12 bar (1.2 MPa; 170 psi)
Heating surface:
 • Firebox		2.58 m2 (27.8 sq ft)
 • Evaporative143.28 m2 (1,542.3 sq ft)
Superheater:
​
 • Heating area58.90 m2 (634.0 sq ft)
Cylinder size575 mm (22+5⁄8 in)
Piston stroke630 mm (24+13⁄16 in)
Valve gearWalschaerts (Heusinger)
Loco brakeCompressed-air brake
Performance figures
Maximum speed100 km/h (62 mph)
Indicated power868 kW (1,180 PS; 1,164 hp)
Career
NumbersDB 78 1001 – 78 1002
Retired1961

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. ISBN 3-87094-083-2.
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