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Specifications
Specifications
Configuration:;
• Whyte	2-4-0T
Gauge	1,435 mm (4 ft 8+1⁄2 in)
Leading dia.	1,040 mm (3 ft 5 in)
Driver dia.	1,340 mm (4 ft 4+3⁄4 in)
Length:;
• Over beams	8,440 mm (27 ft 8+1⁄4 in)
Axle load	12.4 t (12.2 long tons; 13.7 short tons)
Adhesive weight	24.8 t (24.4 long tons; 27.3 short tons)
Service weight	35.8 t (35.2 long tons; 39.5 short tons)
Boiler pressure	12 kgf/cm2 (1,180 kPa; 171 lbf/in2)
Heating surface:
• Firebox	1.20 m2 (12.9 sq ft)
• Evaporative	60.20 m2 (648.0 sq ft)
Cylinder size	330 mm (13 in)
Piston stroke	500 mm (19+11⁄16 in)

Type and origin
Type and origin
Builder	Maffei
Build date	1888–1899
Total produced	55

Bavarian D IX
DRG Class 70.71
Bavarian D IX ; DRG Class 70.71
Builder
Type and origin
Builder	Maffei
Build date	1888–1899
Total produced	55
Configuration:;
Specifications
Configuration:;
• Whyte	2-4-0T
Gauge	1,435 mm (4 ft 8+1⁄2 in)
Leading dia.	1,040 mm (3 ft 5 in)
Driver dia.	1,340 mm (4 ft 4+3⁄4 in)
Length:;
• Over beams	8,440 mm (27 ft 8+1⁄4 in)
Axle load	12.4 t (12.2 long tons; 13.7 short tons)
Adhesive weight	24.8 t (24.4 long tons; 27.3 short tons)
Service weight	35.8 t (35.2 long tons; 39.5 short tons)
Boiler pressure	12 kgf/cm2 (1,180 kPa; 171 lbf/in2)
Heating surface:
• Firebox	1.20 m2 (12.9 sq ft)
• Evaporative	60.20 m2 (648.0 sq ft)
Cylinder size	330 mm (13 in)
Piston stroke	500 mm (19+11⁄16 in)
Maximum speed
Performance figures
Maximum speed	65 km/h (40 mph)
Numbers
Career
Numbers	K.Bay.Sts.E: 1931–1960, 2101–2115; DRG: 70 7101 – 70 7154;
Retired	1932

The D IX steam locomotive was manufactured by the firm of Maffei between 1888 and 1899 for the Royal Bavarian State Railways (Königlich Bayerische Staatsbahn). They were used on the route from Reichenhall via Freilassing to Salzburg. After one engine had been successfully employed on the route to Berchtesgaden, the vehicles were also deployed on the suburban lines of Augsburg, Munich and Nuremberg.

There were scarcely any differences between the various build series. Not until 1896 were minor changes made to the heating areas, the weights and the coal and water capacities. The rigid mounting of the driving and carrying wheels and the location of the cylinder just in front of the carrying wheel did not prove a success. The D IX locomotives could haul 170 tonnes (170 long tons; 190 short tons) on the flat at a speed of 65 km/h (40 mph), on routes with a 2% incline they could manage 95 tonnes (93 long tons; 105 short tons) at 20 km/h (12 mph).

Apart from one engine, which had already been retired by Bavaria, the Reichsbahn took on all the engines. Some were taken out of service even before 1925, the rest had followed by 1932.

No examples of the Bavarian D IX have 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. 64–66. 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. 40–41. ISBN 3-87094-083-2.