Boston & Lowell 2-2-0 "Planet" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class Patrick (Locobase 802)

An 1899 Locomotive History reproduced on [] gives the details (except for the boiler pressure) of this Planet type. See also Angus Sinclair, Development of the Locomotive, pp. 179-180. Railway & Locomotive Historical Society Bulletin #13 (1927) has a report by the railroad of this engine's performance.

The entry notes that the fireboxes in the class varied in depth from 3' 1 1/2" to 3' 3" deep giving heating surfaces of between 36.8 to 38.36 sq ft. The stack had two 1 1/2"-diameter blast pipes.

The other locomotives in the class were Concord, Nashua, Medford, and Suffolk. Sinclair adds that a government commission reporting on railroads in New England said that 35 of this type were then in use. Some were later rebuilt as 2-2-2s by adding a trailing axle under the firebox.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID802
RailroadBoston & Lowell
Number in Class5
Road Numbers
Number Built5
BuilderLowell Manufacturing Co.
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)14,448 / 6554
Weight on Drivers (lbs / kg)14,448 / 6554
Engine Weight (lbs / kg)23,072 / 10,465
Tender Loaded Weight (lbs / kg)14,896 / 6757
Total Engine and Tender Weight (lbs / kg)37,968 / 17,222
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)24 / 12
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)60 / 1524
Boiler Pressure (psi / kPa)70 / 4.80
High Pressure Cylinders (dia x stroke) (in / mm)11" x 16" / 279x406
Tractive Effort (lbs / kg)1920 / 870.90
Factor of Adhesion (Weight on Drivers/Tractive Effort) 7.53
Heating Ability
Firebox Area (sq ft / m2)38.36 / 3.57
Grate Area (sq ft / m2) 6.71 / 0.62
Evaporative Heating Surface (sq ft / m2)304 / 28.25
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)304 / 28.25
Evaporative Heating Surface/Cylinder Volume172.74
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation470
Same as above plus superheater percentage470
Same as above but substitute firebox area for grate area2685
Power L11972
Power MT300.91

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