Bavarian A IV

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

Bavarian A IV
Type and origin
BuilderMaffei
Build date1852
Total produced8
Specifications
Configuration:
​
 • Whyte2-2-2
Gauge1,435 mm (4 ft 8+1⁄2 in)
Leading dia.915 mm (36 in)
Driver dia.1,524 mm (5 ft 0 in)
Trailing dia.915 mm (36 in)
Length:
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 • Over beams12,459 mm (40 ft 10+1⁄2 in)
Axle load11.5 t (11.3 long tons; 12.7 short tons)
Adhesive weight11.5 t (11.3 long tons; 12.7 short tons)
Service weight27.9 t (27.5 long tons; 30.8 short tons)
Water cap.5.0 m3 (1,100 imp gal; 1,300 US gal)
Boiler:
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 • Tube plates3,080 mm (10 ft 1+1⁄4 in)
Boiler pressure7 kgf/cm2 (686 kPa; 99.6 lbf/in2)
Heating surface:
 • Firebox		1.21 m2 (13.0 sq ft)
 • Evaporative73.20 m2 (787.9 sq ft)
Cylinders2
Cylinder size381 mm (15 in)
Piston stroke559 mm (22 in)
Performance figures
Maximum speed70 km/h (43 mph)
Career
NumbersNames and inventory nos.
Retired1883 (one rebuilt in 1874)

The vehicles were developed for night journeys and operations on the North-South Railway. In order to increase the area of the evaporator, the boiler was increased in length to 3,080 mm and in diameter to 1,219 mm. In addition, the weight and the boiler overpressure were raised. These were the first engines to have an outside frame with outside cylinders. This class was used widely, especially in south Germany and in Austria. All the engines bar one were retired by 1883. The survivor was initially converted to a 0-6-0, and later a 0-4-2 wheel arrangement.

They were coupled to 3 T 5 tenders.

See also
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