Bavarian AA I

Bavarian AA I
later P 2/4
DRG Class 36.8
Number(s) 1400
DRG 36 861
Quantity 1
Manufacturer Krauss
Year(s) of manufacture 1896
Retired 1933
Wheel arrangement 4-2-2-2, later 4-4-0
Axle arrangement 2'aA1 n2v, later 2'B h2
Gauge 1,435 mm
Length over buffers 16,570 mm
Service weight 51.7 t
Adhesive weight 29.8 t
Axle load 14.9 t
Top speed 90 km/h
Driving wheel diameter 1,870 mm
Leading wheel diameter 1,006 mm
No. of cylinders 2
Cylinder bore 490 mm
Piston stroke 610 mm
Boiler Overpressure 13 bar
Grate area 2.26 m²
Superheater area 26.85 m²
Evaporative heating area 94.60 m²
Tender Bavarian 3 T 14.5
Water capacity 14.5 m³

The only AA I steam locomotive of the Royal Bavarian State Railways (Königlich Bayerische Staatsbahn) was built by the firm of Krauss in 1896. It had been designed by chief mechanical engineer, Richard von Helmholtz, as a 4-2-2-2 tender locomotive. The engine was largely based on the Bavarian B XI, but the driving and running gear was modified. The second coupled axle was replaced by a fixed carrying axle, and a dolly axle (Vorspannachse) added between the bogie and driving axle. This could be lowered by a pressure cylinder and was driven by an auxiliary engine with two cylinders. Despite her high maintenance requirement, she was economical to run due to her low steam consumption. In 1907 she was rebuilt after an accident into a 2'B h2 locomotive and redesignated as a Class P 2/4. She was taken over by the Deutsche Reichsbahn and run under operating number 36 861. She was the last Bavarian 4-4-0 locomotive to be retired in 1933.

The engine was equipped with a Bavarian 3 T 14.5 tender.

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