The reference for locomotives and railcars


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Boston & Maine classes K-5a and K-5b
United States | 1901 | 34 produced
Railway and Locomotive Engineering, January 1901

Parallel to the K-6 with a two-cylinder compound engine, the Boston & Maine had ALCO in Schenectady build 34 class K-5a and b locomotives with a simple engine. They still had the Stephenson controls but piston valves. According to “Railway and Locomotive Engineering”, the dimensions of the heating surfaces were very well matched to the size of the cylinders. The locomotives later designated as K-5d were actually K-7s with superheaters

Axle config2-8-0 (Consolidation) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase25 ft 6 in
Fixed wheelbase17 ft
Total wheelbase53 ft 10 ft
Service weight162,000 lbs
Adhesive weight142,000 lbs
Axle load35,500 lbs
Water capacity5,000 us gal
Fuel capacity20,000 lbs (coal)
Power sourcesteam
Estimated power1,500 hp (1,119 kW)
Optimal speed29 mph
Starting effort33,443 lbf
Power Plant
Driver diameter61 in
Boiler pressure200 psi
Expansion typesimple
Cylinderstwo, 20 x 30 in
Grate area46.5 sq ft
Firebox area157 sq ft
Tube heating area2,718 sq ft
Evaporative heating area2,875 sq ft
Total heating area2,875 sq ft
Calculated Values
steam locomotive
last changed: 03/2023

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