Boston & Maine classes K-5a and K-5b
United States 1901 34 produced
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 Stephenson valve gear 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. They were retired between 1926 and 1936. The locomotives later designated as K-5d were actually K-7s with superheaters.
Technical data
General
- Built
- 1901
- Manufacturers
- ALCO
- Wheel arrangement
- 2-8-0 (Consolidation)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Wheelbase
- 7.77 m
- Total wheelbase
- 16.41 m
- Service mass
- 73.5 t
- Adhesion mass
- 64.4 t
- Rigid wheelbase
- 5.18 m
- Axle load
- 16.1 t
- Water capacity
- 18,927 l
- Fuel capacity
- 9.1 t (coal)
Boiler
- Grate area
- 4.321 m²
- Firebox surface
- 14.586 m²
- Tube heating surface
- 252.511 m²
- Evaporative heating surface
- 267.096 m²
- Total heating surface
- 267.1 m²
Power plant
- Driver diameter
- 1,549 mm
- Boiler pressure
- 13.8 bar
- Expansion type
- simple expansion
- Cylinders
- two, 508 x 762 mm
Power
- Power source
- steam
- Estimated power
- 1,119 kW
- Starting effort
- 148.8 kN
Calculated values
- Factor of adhesion
- 1 : 4.25
- Optimal speed
- 47 km/h
- Power-to-weight ratio
- 15.2 kW/t
- Heating Surface Equivalent
- 340.0 m²
- Cylinder volume/HSE
- 1 : 908.42
- Adhesive weight/Total
- 1 : 1.14
- Tractive force/Heating surface
- 1 : 11.63
- Grate area/Heating surface
- 1 : 61.81
- Firebox/Tube surface
- 1 : 17.31
