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
Number(s)Names and inventory nos.
Quantity8
ManufacturerMaffei
Year(s) of manufacture1852
Retired1883 (one rebuilt in 1874)
Wheel arrangement2-2-2
Axle arrangement1A1 n2
Track gauge1,435 mm (4 ft 8 1⁄2 in)
Length over buffers12,459 mm (40 ft 10 1⁄2 in)
Service weight27.9 t (27.5 long tons; 30.8 short tons)
Adhesive weight11.5 t (11.3 long tons; 12.7 short tons)
Axle load11.5 t (11.3 long tons; 12.7 short tons)
Top speed70 km/h (43 mph)
Driving wheel diameter1,524 mm (5 ft 0 in)
Leading wheel diameter915 mm (36 in)
Trailing wheel diameter915 mm (36 in)
No. of cylinders2
Cylinder bore381 mm (15 in)
Piston stroke559 mm (22 in)
Boiler length3,080 mm (10 ft 1 1⁄4 in)
Boiler Overpressure7 kgf/cm2 (686 kPa; 99.6 lbf/in2)
Grate area1.21 m2 (13.0 sq ft)
Evaporative heating area73.20 m2 (787.9 sq ft)
Tender3 T 5
Water capacity5.0 m3 (1,100 imp gal; 1,300 US gal)

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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