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
Number(s)DB 78 1001 – 78 1002
Quantity2
ManufacturerKrauss-Maffei
Year(s) of manufacture1951
Retired1961
Wheel arrangement4-6-4T
Axle arrangement2′C2′ h2t
Track gauge1,435 mm (4 ft 8 1⁄2 in)
Length over buffers17,237 mm (56 ft 6 1⁄2 in)
Height4,550 mm (14 ft 11 1⁄8 in)
Overall wheelbase14,070 mm (46 ft 2 in)
Empty weight81 tonnes (80 long tons; 89 short tons)
Service weight110.0 tonnes (108.3 long tons; 121.3 short tons)
Adhesive weight51.1 tonnes (50.3 long tons; 56.3 short tons)
Axle load17.3 tonnes (17.0 long tons; 19.1 short tons)
Top speed100 km/h (62 mph)
Indicated Power868 kW (1,180 PS; 1,164 hp)
Driving wheel diameter1,750 mm (5 ft 8 7⁄8 in)
Leading wheel diameter1,000 mm (3 ft 3 3⁄8 in)
Trailing wheel diameter1,000 mm (3 ft 3 3⁄8 in)
Valve gearWalschaerts (Heusinger)
Cylinder bore575 mm (22 5⁄8 in)
Piston stroke630 mm (24 13⁄16 in)
Boiler Overpressure12 bar (1.2 MPa; 170 psi)
No. of heating tubes123
No. of smoke tubes26
Heating tube length4,700 mm (15 ft 5 in)
Grate area2.58 m2 (27.8 sq ft)
Superheater area58.90 m2 (634.0 sq ft)
Evaporative heating area143.28 m2 (1,542.3 sq ft)
Water capacity17 m3 (600 cu ft) or 17,000 litres (3,700 imp gal; 4,500 US gal)
Fuel5 tonnes (4.9 long tons; 5.5 short tons)
BrakesCompressed-air brake

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.

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.