DB Class 78.10 - Misplaced Pages

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DB Class 78.10

Type and origin
Power type	Steam
Rebuilder	Krauss-Maffei
Rebuild date	1951
Number rebuilt	2

Specifications
Configuration:
• Whyte	4-6-4 T
• 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 m (3,740 imp gal; 4,490 US gal)
Firebox:
• Grate area	2.58 m (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/cm; 174 psi)
Heating surface:
• Firebox	14.47 m (155.8 sq ft)
• Tubes	83.54 m (899.2 sq ft)
• Flues	47.99 m (516.6 sq ft)
• Total surface	146.00 m (1,571.5 sq ft)
Superheater:
• Heating area	58.90 m (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.

v t e Classes of German steam locomotives
Deutsche Bundesbahn (DB) Neubaulok classes	10 23 65 66 82
Deutsche Bundesbahn (DB) Umbaulok (rebuild) classes	78.10
Deutsche Reichsbahn (DR) Neubaulok classes	23.10 25.10 50.40 65.10 83.10 99.23–24 99.77–79
Deutsche Reichsbahn (DR) Rekolok classes	01.5 03.10 Reko 22 41 Reko 50.35–37 52.80 58.30
Deutsche Reichsbahn-Gesellschaft (DRG) classes	DRG steam locomotive classes

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