Bavarian B XI

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Bavarian B XI
DRG Class 36.7–8
|
B XI Zwilling
(two-cylinder)
B XI Verbund
(compound)
Numbering: 1201–1239
from 1926:
DRG 36 701–708
1240–1339
from 1926:
DRG 36 751–826
Quantity: 39 100
Manufacturer: Maffei Maffei, Krauss
Years of Manufacture: 1892–1893 1895–1900
Retirement: by 1926 by 1931
Wheel arrangement: 0-4-0
Axle arrangement: 2'B n2 2'B n2v
Track gauge: 1,435 mm (4 ft 8 12 in)
Length over buffers: 159791 / 168852 mm 16986 mm
Wheel base incl. tender: 128951 / 139702 mm 14095 mm
Service weight: 50.4 t 51.0 / 51.53 t
Adhesive weight: 28.5 t 28.8 / 29.63 t
Axle load: 14.3 t 14.4 / 14.83 t
Top speed: 90 km/h
Driving wheel diameter: 1870 mm
Leading wheel diameter: 1,006 mm
Valve gear: Walschaerts (Heusinger), outside
No. of cylinders: 2
Cylinder bore: 430 mm 455/670 mm
Piston stroke: 610 mm
Boiler overpressure: 12 kg/cm² = 11.77 bar 13 kg/cm² = 12.75 bar
Grate area: 2.24 m² 2.26 m²
Evaporative heating area: 116.2 m² 116.8 m²
Tender: bay 3 T 14.5
bay 2'2' T 18
bay 2'2' T 18
Tender service weight: 36.0 / 43.0 t 43.0 t
Water capacity: 14.5 / 18.0 m³ 18.0 m³
Fuel capacity: 6.0 / 6.5 t coal 6.5 t coal
1 with bay 3 T 14.5 tender
2 with bay 2'2' T 18 tender
3 from no. 1318

The Class B XI engines of the Royal Bavarian State Railways (Königlich Bayerische Staatsbahn) were built between 1895 and 1900 by the firm of Maffei for deployment in Bavaria. The first delivery comprised 39 vehicles with two-cylinder, saturated steam operation, a further 100 two-cylinder compound locomotives followed in the period up to 1900.

The Deutsche Reichsbahn took over 8 engines from the first batch as Class 36.7, with operating numbers 36 701 to 36 708, and 76 of the second batch, with numbers 36 751 to 36 826.

These steam locomotives were equipped with Bavarian 3 T 12, 3 T 14.5 and 2'2' T 18 tenders. These vehicles were the first locos that were give a four-axle tender.

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