Bavarian A II

The Bavarian A II engines were early German 2-2-2 steam locomotives with the Royal Bavarian State Railways (Königlich Bayerische Staatsbahn).

Bavarian A II
Number(s)Names and inventory nos.
Quantity13
ManufacturerKessler, Maffei
Year(s) of manufacture1847–1848
Retiredby 1877 (some were converted)
Wheel arrangement2-2-2
Axle arrangement1A1 n2
Track gauge1,435 mm (4 ft 8 1⁄2 in)
Length over buffers12,496 mm (41 ft 0 in)
Service weight21.8 t (21.5 long tons; 24.0 short tons)
Adhesive weight7.6 t (7.5 long tons; 8.4 short tons)
Axle load7.6 t (7.5 long tons; 8.4 short tons)
Top speed45 km/h (28 mph)
Driving wheel diameter1,524 mm (5 ft 0 in)
Leading wheel diameter915 mm (3 ft 0 in)
Trailing wheel diameter915 mm (3 ft 0 in)
No. of cylinders2
Cylinder bore318 mm (12 1⁄2 in)
Piston stroke559 mm (22 in)
Boiler Overpressure6 kgf/cm2 (588 kPa; 85.3 lbf/in2)
Grate area0.83 m2 (8.9 sq ft)
Evaporative heating area71.00 m2 (764.2 sq ft)
Tender2 T 4,2
Water capacity4.2 m3 (920 imp gal; 1,100 US gal)

The locomotives were conceived as Stephenson Long Boiler engines. They had an inside forked frame and the firebox was supported by the trailing axle. The only difference between the engines from the two manufacturers was the location of the feed pump. On the Kessler variant this was on the outside and driven by crank pins; on the Maffei version they were suspended from the reverse eccentric cam (Rückwärtsexzenter).

After it was discovered that the riding qualities of the loco were very rough, the trailing axle was moved about 127 mm (5.0 in) further back. In the 1860s the old boiler on some vehicles was replaced by a Crampton boiler. In addition, six engines were rebuilt with a wheel arrangement of 0-6-0 and three into 0-4-2 locomotives. The remainder were taken out of service between 1871 and 1877 and scrapped.

They were coupled with 2 T 4.2 tenders.

See also
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