Bavarian BB II

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Bavarian BB II
DRG Class 98.7
98 727 2.jpg
DRG 98 727 in Bochum-Dahlhausen (1985)
Number(s) DRG 98 701–371
Quantity 31
Manufacturer Maffei
Year(s) of manufacture 1899–1908
Retired 1940 (?)
Wheel arrangement 0-4-4-0
Axle arrangement B'B n4vt
Track gauge 1,435 mm (4 ft 8 12 in)
Length over buffers 10,010 mm
Service weight 42.6 t
Adhesive weight 42.6 t
Axle load 10.7 t
Top speed 45 km/h
Indicated Power 280 kW
Driving wheel diameter 1,006 mm
No. of cylinders 4
LP cylinder bore 490 mm
HP cylinder bore 310 mm
Piston stroke 530 mm
Boiler Overpressure 12 bar
Grate area 1.40 m2
Evaporative heating area 67.70 m2
Locomotive brakes Vacuum brakes, later compressed air brakes

The Bavarian Class BB II engines were Mallet saturated steam locomotives in the service of the Royal Bavarian State Railways (Königlich Bayerische Staats-Eisenbahnen).

They were specially designed for branch lines with tight curves and supplied in two series. The first series comprised 29 engines and was built between 1899 and 1903. The other two machines were delivered in 1908 to the state railway and were somewhat longer and heavier than the other locomotives.

Although the Deutsche Reichsbahn-Gesellschaft took over all the vehicles in 1925 as DRG Class 98.7, all bar three were retired during the 1930s due to their unsatisfactory riding performance. The last three engines were used after 1940 as industrial locomotives.

One example, the 98 727, was sold in 1943 to the Regensburg factory of Südzucker AG and was given the operating number 4. It was donated in 1972 to the Darmstadt-Kranichstein Railway Museum (Eisenbahnmuseum Darmstadt-Kranichstein) and is still preserved today.

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