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Bavarian B IX
German Reichsbahn class 3474
Germany | 1874 | 104 produced
Cutaway model in the Deutsches Museum in Munich
Cutaway model in the Deutsches Museum in Munich
MPW57

In 1869 and 1870, some locomotives with the wheel arrangements 2-2-2 and 4-2-0 (Crampton) were converted into four-coupled ones in order to increase the tractive effort for the increased loads in express traffic. Four locomotives with 0-4-2 wheel arrangement were then ordered and assigned to class B IX, but soon sold to the Reichseisenbahnen Alsace-Lorraine. Finally, in 1874, Maffei began to manufacture the new B IX, which had a 2-4-0 wheel arrangement and was thus the first four-coupled express locomotive in Bavaria to be procured in series.

Since at that time engineers had already come to the realization that overhanging masses impair the running properties at high speeds, attempts were made to reduce them as much as possible. With the B VIII, which was built in small numbers, experience had already been gained with a firebox whose center of gravity was directly above the second coupled axle, and this feature was adopted with the B IX. In order to also minimize the front overhangs, the cylinders were moved as close as possible to the leading axle. Like the previous series, the B IX had an outer frame, internal Stephenson valve gear and external cylinders. Due to its smooth running, it could be approved for 90 km/h and, with a train weight of 150 tonnes, reached a speed of 70 km/h on the flat.

A total of 104 engines were made between 1874 and 1887. After the end of the First World War, they were no longer used in high-value express service, but the remaining units with the numbers 34 7421 to 34 7440 were included in the Reichsbahn's provisional renumbering plan. However, the new numbers did not need to be attached, since the last machines were retired in 1925. Today, the locomotive with the number 1000 can be viewed as a cutaway model in the Lokwelt Freilassing, a branch of the Deutsches Museum in Munich.

General
Built1874-1887
ManufacturerMaffei
Axle config2-4-0 (Porter) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length45 ft 9 5/8 in
Service weight74,075 lbs
Adhesive weight48,502 lbs
Axle load25,574 lbs
Water capacity2,774 us gal
Fuel capacity11,023 lbs (coal)
Power
Power sourcesteam
Estimated power402 hp (300 kW)
Optimal speed25 mph
Top speed56 mph
Starting effort10,272 lbf
Power Plant
Driver diameter73.6 in
Boiler pressure145 psi
Expansion typesimple
Cylinderstwo, 16 x 24 in
Boiler
Grate area16.1 sq ft
Evaporative heating area952.6 sq ft
Total heating area952.6 sq ft
Calculated Values
steam locomotive
express
last changed: 01/2022
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