DB Class 78.10

DB Class 78.10
Type and origin
Power typeSteam
RebuilderKrauss-Maffei
Rebuild date1951
Number rebuilt2
Specifications
Configuration:
​
 • Whyte4-6-4T
 • UIC2′C′2 h2t
 • GermanPt 37.17
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:​
 • 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) =
 • Engine14,070 mm (46 ft 2 in)
Length:
​
 • Over headstocks15,937 mm (52 ft 3+1⁄2 in)
 • Over buffers17,237 mm (56 ft 6+1⁄2 in)
Height4,550 mm (14 ft 11+1⁄8 in)
Axle load17.0 t (16.7 long tons; 18.7 short tons)
Adhesive weight51.1 t (50.3 long tons; 56.3 short tons)
Empty weight81.1 t (79.8 long tons; 89.4 short tons)
Service weight109.7 t (108.0 long tons; 120.9 short tons)
Fuel typeCoal
Fuel capacity5 t (4.9 long tons; 5.5 short tons)
Water cap.17 m3 (3,740 imp gal; 4,490 US gal)
Firebox:​
 • Grate area2.58 m2 (27.8 sq ft)
Boiler:
​
 • Tube plates4,700 mm (15 ft 5 in)
 • Small tubes51 mm (2 in), 123 off
 • Large tubes133 mm (5+1⁄4 in), 26 off
Boiler pressure12 bar (12.2 kgf/cm2; 174 psi)
Heating surface:​
 • Firebox14.47 m2 (155.8 sq ft)
 • Tubes83.54 m2 (899.2 sq ft)
 • Flues47.99 m2 (516.6 sq ft)
 • Total surface146.00 m2 (1,571.5 sq ft)
Superheater:
​
 • Heating area58.90 m2 (634.0 sq ft)
CylindersTwo, outside
Cylinder size575 mm × 630 mm (22+5⁄8 in × 24+13⁄16 in)
Valve gearHeusinger (Walschaerts)
Train brakesCompressed-air brake
Performance figures
Maximum speed100 km/h (62 mph)
Indicated power1,180 PS (868 kW; 1,160 hp)
Career
OperatorsDeutsche Bundesbahn
Numbers78 1001 – 78 1002
Retired1961

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.