Boston & Maine 0-4-4 "Forney" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class Governor Brooks/D-2 (Locobase 10872)

Data from B&M 8 - 1919 Loco Class supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also Harry A Frye, Minuteman steam: Boston & Maine steam locomotives, 1911-1958 (Littleton, MA : Boston and Maine Railroad Historical Society, 1982). Works numbers were 2617-2619 in February 1891.

These Forney tanks were named for Governors (the second was called Governor Carver and the third Governor Winthrop). They provided bi-directional power for commuter trains out of Boston, probably on the Medford Branch.

All were renumbered, taking 47-49 in 1911. They were soon retired in October 1913, November 1913, and November 1914, respectively.

Principal Dimensions by Steve Llanso of Sweat House Media
ClassGovernor Brooks/D-2
Locobase ID10,872
RailroadBoston & Maine (B&M)
Number in Class3
Road Numbers471-473/47-49
Number Built3
BuilderRhode Island
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 6.50 / 1.98
Engine Wheelbase (ft / m)21.92 / 6.68
Ratio of driving wheelbase to overall engine wheebase 0.30
Overall Wheelbase (engine & tender) (ft / m)21.92 / 6.68
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)66,000 / 29,937
Engine Weight (lbs / kg)134,000 / 60,781
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)134,000
Tender Water Capacity (gals / ML)1500 / 5.68
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)55 / 27.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)54 / 1372
Boiler Pressure (psi / kPa)150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)16" x 20" / 406x508
Tractive Effort (lbs / kg)12,089 / 5483.48
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.46
Heating Ability
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2)13.10 / 1.22
Evaporative Heating Surface (sq ft / m2)950 / 88.26
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)950 / 88.26
Evaporative Heating Surface/Cylinder Volume204.12
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1965
Same as above plus superheater percentage1965
Same as above but substitute firebox area for grate area
Power L1
Power MT

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Wes Barris