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.
Quantity	8
Manufacturer	Maffei
Year(s) of manufacture	1852
Retired	1883 (one rebuilt in 1874)
Wheel arrangement	2-2-2
Axle arrangement	1A1 n2
Track gauge	1,435 mm (4 ft 8 ^1⁄2 in)
Length over buffers	12,459 mm (40 ft 10 ^1⁄2 in)
Service weight	27.9 t (27.5 long tons; 30.8 short tons)
Adhesive weight	11.5 t (11.3 long tons; 12.7 short tons)
Axle load	11.5 t (11.3 long tons; 12.7 short tons)
Top speed	70 km/h (43 mph)
Driving wheel diameter	1,524 mm (5 ft 0 in)
Leading wheel diameter	915 mm (36 in)
Trailing wheel diameter	915 mm (36 in)
No. of cylinders	2
Cylinder bore	381 mm (15 in)
Piston stroke	559 mm (22 in)
Boiler length	3,080 mm (10 ft 1 ^1⁄4 in)
Boiler Overpressure	7 kgf/cm^2 (686 kPa; 99.6 lbf/in^2)
Grate area	1.21 m^2 (13.0 sq ft)
Evaporative heating area	73.20 m^2 (787.9 sq ft)
Tender	3 T 5
Water capacity	5.0 m^3 (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

• List of Bavarian locomotives and railbuses