This single locomotive was originally sent to the five-mile railroad that operated out of Franklin, NH. The F&T was completed in 1892. Three years later, the Concord & Montreal leased the railroad on 8 October 1895. Immediately, the C&M leased the line to the Boston & Maine.
A later batch of six with some changes came four years later; see Locobase 10872.
This commuter design was a compact version of a standard Mogul and tender had an upright look and a large cab with arched windows. They were based on the 1891 F&T #1 shown in Locobase 16209, repeating most of the details but increasing the boiler pressure by 20 psi (1.38 bar) and increasing tank capacity by 500 US gallons (1,893 litres).
Harry Frye described the class as "an interesting innovation" for commuter trains servicing Boston and Portland. "Capable of running forward or reverse with equal ease, and with pilots [successors to "cowcatchers"] on either end of the machine, they could shuttle commuters out and back without benefit of turntable or wye--doubly nice as some of the branches they ran had neither."
Except for the 45, which went to the scrapyard in September 1914, the class was withdrawn and scrapped in July and August 1920.
NB: The direct heating surface (including the firebox heating surface) is an estimate calculated by subtracting the calculated tube heating surface from the reported total evaporative heating surface.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Franklin & Tilton (B&M)||Boston & Maine (B&M)|
|Number in Class||1||6|
|Builder||Rhode Island||Rhode Island|
|Locomotive Length and Weight|
|Driver Wheelbase (ft)||13||13|
|Engine Wheelbase (ft)||30||30|
|Ratio of driving wheelbase to overall engine wheebase||0.43||0.43|
|Overall Wheelbase (engine & tender) (ft)||30||30|
|Axle Loading (Maximum Weight per Axle) (lbs)|
|Weight on Drivers (lbs)||90,000||90,000|
|Engine Weight (lbs)||133,000||133,000|
|Tender Loaded Weight (lbs)|
|Total Engine and Tender Weight (lbs)||133,000||133,000|
|Tender Water Capacity (gals)||2000||2500|
|Tender Fuel Capacity (oil/coal) (gals/tons)||3.50||3.50|
|Minimum weight of rail (calculated) (lb/yd)||50||50|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in)||54||54|
|Boiler Pressure (psi)||140||175|
|High Pressure Cylinders (dia x stroke) (in)||17" x 24"||17" x 24"|
|Tractive Effort (lbs)||15,285||19,106|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||5.89||4.71|
|Firebox Area (sq ft)||116||118|
|Grate Area (sq ft)||17.50||17.50|
|Evaporative Heating Surface (sq ft)||952||952|
|Superheating Surface (sq ft)|
|Combined Heating Surface (sq ft)||952||952|
|Evaporative Heating Surface/Cylinder Volume||150.99||150.99|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||2450||3063|
|Same as above plus superheater percentage||2450||3063|
|Same as above but substitute firebox area for grate area||16,240||20,650|