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 or 13,670 mm (41 ft 3 ^1⁄2 in or 44 ft 10 ^1⁄4 in)
Service weight	24.8 or 26.0 t (24.4 or 25.6 long tons; 27.3 or 28.7 short tons)
Adhesive weight	17.1 or 17.4 t (16.8 or 17.1 long tons; 18.8 or 19.2 short tons)
Axle load	8.5 or 8.7 t (8.4 or 8.6 long tons; 9.4 or 9.6 short tons)
Top speed	65 km/h (40 mph)
Driving wheel diameter	1,372 or 1,400 mm (4 ft 6 in or 4 ft 7 ^1⁄8 in)
Leading wheel diameter	915 mm (3 ft 0 in)
No. of cylinders	2
Cylinder bore	381 mm (15 in)
Piston stroke	610 mm (24 in)
Boiler Overpressure	6 or 8 kgf/cm^2 (588 or 785 kPa; 85.3 or 114 lbf/in^2)
Grate area	0.86 or 0.93 m^2 (9.3 or 10.0 sq ft)
Evaporative heating area	79.90 or 74.50 m^2 (860.0 or 801.9 sq ft)
Tender	3 T 4.2 or 3 T 5
Water capacity	4.2 or 5.0 m^3 (920 or 1,100 imp gal; 1,100 or 1,300 US gal)

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