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 Middle Run Media | |
|---|---|
| Class | Governor Brooks/D-2 |
| Locobase ID | 10872 |
| Railroad | Boston & Maine (B&M) |
| Country | USA |
| Whyte | 0-4-4T |
| Number in Class | 3 |
| Road Numbers | 471-473/47-49 |
| Gauge | Std |
| Number Built | 3 |
| Builder | Rhode Island |
| Year | 1891 |
| Valve Gear | Stephenson |
| 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 wheelbase | 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 / Liters/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 / 1030 |
| 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 | |
| Tubes (number - dia) (in / mm) | 140 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 10.50 / 3.20 |
| 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 Volume | 204.30 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1965 |
| Same as above plus superheater percentage | 1965 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |