Boston & Providence 0-6-0 "Switcher" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class Highlander (Locobase 9536)

Data from table entitled "Motive Power Boston & Providence Railroad Company," Railway and Locomotive Engineering, October 1899, page 443, which was prepared by George S Griggs, then (November 1856) Superintendent of Motive Power at the B & P's Roxbury, Mass Machine Shop. See also Data from table entitled "Table of Dimensions of the Locomotives" in New England Association of Railway Superintendents, Report of the Trials of Locomotive Engines Made Upon 1st and 2nd October, 1851 (Boston: B J Yerrinton, Printers, 1852), p. 16.

This may have been a switcher as it one of a few using the all-coupled wheel arrangement then popular in Europe for freight engines. Its smaller boiler and grate suggest a short-range aspiration. It was delivered in June 1850.

In the October 1851 trials, the two all-adhesion freight engines (the other being Milo, Locobase 13552) ran a different route that measured only 1.7 miles in length. They each hauled a 650-ton train consisting of 114 loaded cars.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID9536
RailroadBoston & Providence
Number in Class1
Road Numbers
Number Built1
BuilderB&P Roxbury
Valve Geardrop-hook
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheebase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)41,200 / 18,688
Engine Weight (lbs / kg)41,200 / 18,688
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)1430 / 5.42
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT) 1.50 / 1.40
Minimum weight of rail (calculated) (lb/yd / kg/m)23 / 11.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48 / 1219
Boiler Pressure (psi / kPa)120 / 5.20
High Pressure Cylinders (dia x stroke) (in / mm)14.75" x 18" / 375x457
Tractive Effort (lbs / kg)8322 / 3774.80
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.95
Heating Ability
Firebox Area (sq ft / m2)51.80 / 4.81
Grate Area (sq ft / m2) 8.90 / 0.83
Evaporative Heating Surface (sq ft / m2)659 / 61.25
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)659 / 61.25
Evaporative Heating Surface/Cylinder Volume185.12
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1068
Same as above plus superheater percentage1068
Same as above but substitute firebox area for grate area6216
Power L12476
Power MT397.47

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Wes Barris