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Bavarian BB II
German Reichsbahn class 987
Germany | 1899 | 31 produced
Werner & Hansjörg Brutzer

The problem on the Bavarian local railways was that there were very tight curves in some cases, and there were also many inclines and therefore increasingly more powerful locomotives were needed for the ever increasing requirements. For this reason, the BB II was developed, whose coupled axles were not in a common frame for better running characteristics in curves.

As a Mallet-type tank locomotive with only two axles each in the frame and in the bogie, it was ideal for the winding routes. Due to the lack of carrying axles, the running properties at line speed proved to be insufficient. In addition, the locomotive tended to slip and was therefore not always able to fully utilize its power.

Production consisted of a series of 29 machines between 1899 and 1903 and a second series from 1908, in which only two examples were made. The latter were slightly longer and heavier than the previous ones. They were all taken over by the Reichsbahn in 1925 and classified as class 987. However, due to the shortcomings described, most of them were already phased out in the 1930s. The remaining ones were sold to various works railways from around 1940, where the smooth running of the machines was not a problem. The former 98 727, which was sold to Südzucker AG in 1943, is now being kept operational by the Darmstadt-Kranichstein Railway Museum. Due to the advertising character of its former operator, it was nicknamed “Zuckersusi” (“Sugar Susi”).

General
Built1899-1908
ManufacturerMaffei
Axle config0-4-4-0T (Four Coupled Mallet) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length32 ft 10 1/8 in
Wheelbase17 ft 0 3/4 in
Fixed wheelbase5 ft 3 in
Service weight93,917 lbs
Adhesive weight93,917 lbs
Axle load23,589 lbs
Water capacity1,136 us gal
Fuel capacity4,409 lbs (coal)
Power
Power sourcesteam
Indicated power375 hp (280 kW)
Optimal speed14 mph
Top speed28 mph
Starting effort16,578 lbf
with start valve19,894 lbf
Power Plant
Driver diameter39.6 in
Boiler pressure174 psi
Expansion typecompound
Cylindersfour, HP: 12 3/16 x 20 7/8 in
and LP: 19 5/16 x 20 7/8 in
Boiler
Grate area15.1 sq ft
Evaporative heating area728.7 sq ft
Total heating area728.7 sq ft
Calculated Values
steam locomotive
freight
Mallet
secondary line
last changed: 01/2022
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