Bavarian B I

Bavarian B I engines were 2-4-0 steam locomotives of the Royal Bavarian State Railways (Königlich Bayerische Staatsbahn).

Bavarian B I
Year(s) of manufacture	1847ff.
Retired	1896
Wheel arrangement	2-4-0
Axle arrangement	1B n2
Track gauge	1,435 mm (4 ft 8 ^1⁄2 in)
Length over buffers	12,585/13,670 mm
Service weight	24.8/26.0 t
Adhesive weight	17.1/17.4 t
Axle load	8.5/8.7 t
Top speed	65 km/h
Driving wheel diameter	1,372/1,400 mm
Leading wheel diameter	915 mm
No. of cylinders	2
Cylinder bore	381 mm
Piston stroke	610 mm
Boiler Overpressure	6/8 bar
Grate area	0.86/0.93 m^2
Evaporative heating area	79.90/74.50 m^2
Tender	3 T 4.2/5
Water capacity	4.2/5.0 m^3

The Class B I was developed in parallel with the Class A II, but had a coupled axle instead of a second carrying axle. As a result, it developed a higher tractive effort. It also had a Stephenson Long Boiler, forked frame and an outside Stephenson valve gear with outside cylinders. The coupling rods were based on an American prototype. Later many of the engines were fitted with a Crampton boiler.

They were coupled to 3 T 4.2, and later 3 T 5, tenders.

See also

• List of Bavarian locomotives and railbuses