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 manufacture1847ff.
Retired1896
Wheel arrangement2-4-0
Axle arrangement1B n2
Track gauge1,435 mm (4 ft 8 1⁄2 in)
Length over buffers12,585 or 13,670 mm (41 ft 3 1⁄2 in or 44 ft 10 1⁄4 in)
Service weight24.8 or 26.0 t (24.4 or 25.6 long tons; 27.3 or 28.7 short tons)
Adhesive weight17.1 or 17.4 t (16.8 or 17.1 long tons; 18.8 or 19.2 short tons)
Axle load8.5 or 8.7 t (8.4 or 8.6 long tons; 9.4 or 9.6 short tons)
Top speed65 km/h (40 mph)
Driving wheel diameter1,372 or 1,400 mm (4 ft 6 in or 4 ft 7 1⁄8 in)
Leading wheel diameter915 mm (3 ft 0 in)
No. of cylinders2
Cylinder bore381 mm (15 in)
Piston stroke610 mm (24 in)
Boiler Overpressure6 or 8 kgf/cm2 (588 or 785 kPa; 85.3 or 114 lbf/in2)
Grate area0.86 or 0.93 m2 (9.3 or 10.0 sq ft)
Evaporative heating area79.90 or 74.50 m2 (860.0 or 801.9 sq ft)
Tender3 T 4.2 or 3 T 5
Water capacity4.2 or 5.0 m3 (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
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