Bavarian B IX

Bavarian B IX
DRG Class 34.74
Number(s) 602 STEINBERG to 139 SALZBURG
DRG 34 7421–7440
Quantity 104
Year(s) of manufacture 1874-1887
Retired by 1924
Wheel arrangement 2-4-0
Axle arrangement 1B n2
Gauge 1,435 mm
Length over buffers 13,960–14,050
Service weight 33.6 t
Adhesive weight 22.0 t
Axle load 11.0 t
Top speed 90 km/h
Driving wheel diameter 1,870 mm
Leading wheel diameter 1,170 mm
No. of cylinders 2
Cylinder bore 406 mm
Piston stroke 610 mm
Boiler Overpressure 10 bar
Grate area 1.50/1.70 m²
Evaporative heating area 88.50/91.00 m²
Tender Bavarian 3 T 10,5
Water capacity 10.5 m³
Locomotive brakes Heberlein quick-acting brake

The B IXs of the Royal Bavarian State Railways (Königlich Bayerische Staatsbahn), built from 1874, were the first express train locomotives in Bavaria. (N.B. The engines described here are not to be confused with the B IX steam engines built in 1870 and described under Bavarian B IX (1870).)

As a result of the boiler being positioned low and the rear driving axle being under the outer firebox there was no longer any overhanging weight and the speed of the engine could be increased to 90 km/h. The locomotive could also haul a 150-ton train on the level at a speed of 70 km/h. The engines, retaining the design of their forerunners, had an outside locomotive frame and Stephenson valve gear. The units taken over by the Reichsbahn were run under the operating numbers 34 7421–7440. The locomotives built from 1874 were retired by 1924.

At the Deutsches Museum in Munich a sectioned example has been preserved. Parts of the collection, including the B IX, are stored in the Freilassing Locomotive World (Lokwelt Freilassing) museum in Freilassing due to a shortage of space.

The vehicles were coupled to Bavarian 3 T 10,5 tenders.

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