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Steam
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Boston & Maine class B-15
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Page views since 2023-01-26: 7,566,439
Boston & Maine class B-15
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United States | 1903
140 produced
Image of locomotive

Between 1903 and 1907, ALCO built 140 Moguls for the Boston & Maine. These were numbered between 1360 and 1499 and the first variant was designated B-15. All of these were built at Manchester between 1903 and 1907. A batch built at Schenectady in 1909 and two more batches built at Manchester in 1910 and 1911 were 2,200 pounds heavier and were designated B-15a.

78 of these locomotives were superheated and upgraded in other aspects starting in 1918. Due to the different weight of the two variants, the B-15 were called B-15b and the B-15a were called B-15c after the rebuild. In 1926, the B&M sold some of the non-rebuilt locomotives to smaller operators and the others were retired between 1930 and 1936. The last of the superheated locomotives was retired in 1955.

VariantB-15, B-15arebuilt B-15b, B-15c
General
Built1903-1907from 1918
ManufacturerALCOBoston & Maine
Wheel arr.2-6-0 (Mogul) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase22 ft 9 in
Rigid wheelbase15 ft
Total wheelbase51 ft 2 in
Service weight145,000 lbs150,000 lbs
Adhesive weight122,800 lbs128,000 lbs
Total weight215,890 lbs220,890 lbs
Axle load40,934 lbs45,900 lbs
Water capacity5,000 us gal
Fuel capacity20,000 lbs (coal)
Boiler
Grate area30.2 sq ft30.3 sq ft
Firebox area159.4 sq ft158 sq ft
Tube heating area1,733.6 sq ft1,288 sq ft
Evaporative heating area1,893 sq ft1,446 sq ft
Superheater area302 sq ft
Total heating area1,893 sq ft1,748 sq ft
VariantB-15, B-15arebuilt B-15b, B-15c
Power Plant
Driver diameter63 in
Boiler pressure200 psi
Expansion typesimple
Cylinderstwo, 19 x 26 in
Power
Power sourcesteam
Estimated power950 hp (708 kW)1,150 hp (858 kW)
Starting effort25,327 lbf
Calculated Values
steam locomotive
passenger
freight
last changed: 10/2025
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