Bavarian B IX (Ostbahn)

The Bavarian Class A, later B IX were German steam locomotives with the Bavarian Eastern Railway (Bayerische Ostbahn).

B IX (Bayern)
Number(s):	1081–1092	1069–1080
Quantity:	12	12
Manufacturer:	Keßler, Maffei
Year(s) of manufacture:	1857ff.	1859ff.
Retired:	1926	1903
Wheel arrangement (Whyte):	4-2-0	2-2-2
Axle arrangement(UIC):	2A n2	1A1 n2
Track gauge:	1,435 mm (4 ft 8 ^1⁄2 in)
Length over buffers:	13.710 mm	11,850 mm
Service weight:	25.9 t
Adhesive weight:	10.5 t
Top speed:	90 km/h
Driving wheel diameter:	1.828 mm
Leading wheel diameter:	1.220 mm
Trailing wheel diameter:		1.220 mm
No. of cylinders:	2
Cylinder bore:	394 mm
Piston stroke:	610 mm
Boiler overpressure:	6 bar
Grate area:	1,13 m²	1.12 m²
Evaporative heating area:	83,20 m²	80.00 m²
Tender:	3 T 7
Water capacity:	7.0 m³

Crampton version

The engines had an external frame with outside drive and valve gear. They had the smallest wheel diameter (1,828 mm) of any locomotive of this type in the whole of Germany. Between 1869 and 1871 all the engines were rebuilt in Regensburg and were given a 1 B axle arrangement. They were then given locomotive numbers 1081–1092.

Stephenson version

The second series of this class was built to a Stephenson design. They did not differ greatly in terms of boiler and driving gear from the locomotives of the first series. These engines were also converted in Regensburg between 1870 and 1871 to vehicles with a 1B axle formula. In addition the boiler overpressure was raised from 6 to 10 bar. They were then given locomotive numbers 1069–1080.

Tender

Both series were equipped with 3 T 7 tenders.

See also

• Royal Bavarian State Railways
• List of Bavarian locomotives and railbuses