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Imperial Russian Railways series Б
Russia | 1907 | 252 produced
Б-101 with its original Number А<sub>Б</sub>-126
Б-101 with its original Number АБ-126

The Russian railways used the letter Б (B) to group express locomotives with a 4-6-0 wheel arrangement, i.e. in Russian notation 2-3-0. Between 1896 and 1903, locomotives with four-cylinder compound engines were manufactured for several railway administrations. The driver's cab was closed off to the rear by the tender. They had cylinder diameters of 370 and 580 mm with a stroke of 650 mm and a coupling wheel diameter of 1,730 mm. In Russian conditions, especially in the harsh winters, maintenance of the four-cylinder engine proved too complicated. They also proved to be too fuel-intensive on long, straight stretches. As a result, many locomotives were converted to simple engines from around 1910 and fitted with superheaters. The new cylinders had a relatively long stroke of 700 mm with a diameter of only 550 mm.

In 1907, the Moscow-Kyiv-Voronesh Railway ordered three locomotives from the Bryansk works, which already equaled the two-cylinder superheated version ex works. From 1909 other railways ordered more examples of this design, so that the number increased to 252, of which 99 were built in Luhansk. The locomotives reached up to 125 km/h in test drives and were certified for 105 km/h. This was later increased to 115 km/h. With the introduction of more modern locomotives, the Б series locomotives were later moved to the eastern, more sparsely populated areas and finally retired in the 1950s.

Variantcompoundsimple
General
Built1907, 1909-1914
ManufacturerBrjansk, Lugansk
Axle config4-6-0 (Ten-wheeler) 
Gauge4 ft 11 13/16 in (Russian broad gauge)
Dimensions and Weights
Length loco37 ft 8 11/16 in
Service weight164,134 lbs
Adhesive weight101,192 lbs
Axle load34,568 lbs
Fuel capacitycoal
Power
Power sourcesteam
Indicated power1,282 hp (956 kW)
Optimal speed95 mph28 mph
Top speed71 mph
Starting effort8,583 lbf28,738 lbf
with start valve10,300 lbf
Power Plant
Driver diameter72 in
Boiler pressure188 psi
Expansion typecompoundsimple
Cylinderstwo, HP: 14 9/16 x 25 9/16 in
and LP: 22 13/16 x 25 9/16 in
two, 21 5/8 x 27 9/16 in
Boiler
Grate area28 sq ft19.4 sq ft
Evaporative heating area1,980.6 sq ft1,773.9 sq ft
Superheater area441.3 sq ft
Total heating area2,421.9 sq ft2,215.2 sq ft
Calculated Values
steam locomotive
express
last changed: 06/2022
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