Bavarian D I

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Bavarian D I
Number(s) Names and works nos.
DRG 88 7011–7017 (planned)
Quantity 15
Manufacturer Maffei
Year(s) of manufacture 1871-75
Retired by 1923
Wheel arrangement 0-4-0
Axle arrangement B n2t
Track gauge 1,435 mm (4 ft 8 12 in)
Length over buffers 7.100 mm
Overall wheelbase 2,135 mm
Service weight 22.4 and 23.5 t
Adhesive weight 22.4 and 23.5 t
Axle load 11.2 and 11.8 t (centre)
Top speed 45 km/h
Driving wheel diameter 996, later 1,006 mm
Valve gear Stephenson, outside
No. of cylinders 2
Cylinder bore 2380 mm
Piston stroke 508 mm
Boiler Overpressure 10 kp/cm2 = 9.81 bar
Grate area 0.74 m2
Evaporative heating area 47.0 m2
Water capacity 1.74 and 3.0 m3
Fuel 1.2 t coal
Brakes Exter counterweight brake

Class D I of the Royal Bavarian State Railways (Königlich Bayerische Staatsbahn) was a tank locomotive with two coupled axles designed for shunting. As had been specified, these locomotives were simple and robust. They had a double-frame, with water tanks being suspended between the sole bars of the front section. Because the water capacity of 1.74 m3 soon proved too little even for a shunter operating only within the limits of its own station, additional side tanks were added to some engines during the 1880s. The outside Stephenson valve gear moved the valves on top of the horizontal cylinders. The locomotives could be braked using an Exter counterweight brake.

The D I saw shunting duties on small and medium-sized stations, for example in Schwandorf, Straubing or Neumarkt in der Oberpfalz. 13 locomotives were still in service when the Bavarian State Railway transferred to the Deutsche Reichsbahn in 1920. Seven vehicles were allocated numbers in the DRG renumbering plan for steam locomotives, but none were implemented as they were retired in 1923.

See also[edit]


  • v. Welser, Ludwig (1995). Bayern-Report. Band No. 5. Fürstenfeldbruck: Merker Verlag. ISBN 3-922404-78-2.