Boston & Maine / Franklin & Tilton 2-6-4 "Adriatic" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class 1/E-1b (Locobase 16209)

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 number was 2691 in December 1891.

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.


Class E-1a (Locobase 10871)

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 3070 in May 1895, 3071-3075 in June.

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Except for the 45, which went to the scrapyard in September 1914, the class was withdrawn and scrapped in July and August 1920.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
Class1/E-1bE-1a
Locobase ID16,209 10,871
RailroadFranklin & Tilton (B&M)Boston & Maine (B&M)
CountryUSAUSA
Whyte2-6-4T2-6-4T
Number in Class16
Road Numbers1/46158+/40-45
GaugeStdStd
Number Built16
BuilderRhode IslandRhode Island
Year18911895
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)13 / 3.9613 / 3.96
Engine Wheelbase (ft / m)30 / 9.1430 / 9.14
Ratio of driving wheelbase to overall engine wheebase 0.43 0.43
Overall Wheelbase (engine & tender) (ft / m)30 / 9.1430 / 9.14
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)90,000 / 40,82390,000 / 40,823
Engine Weight (lbs / kg)133,000 / 60,328133,000 / 60,328
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)133,000133,000
Tender Water Capacity (gals / ML)2000 / 7.582500 / 9.47
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT) 3.50 / 3.20 3.50 / 3.20
Minimum weight of rail (calculated) (lb/yd)5050
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)54 / 137254 / 1372
Boiler Pressure (psi / kPa)140 / 9.70175 / 12.10
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x61017" x 24" / 432x610
Tractive Effort (lbs / kg)15,285 / 6933.1719,106 / 8666.35
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.89 4.71
Heating Ability
Firebox Area (sq ft / m2)116 / 10.78118 / 10.96
Grate Area (sq ft / m2)17.50 / 1.6317.50 / 1.63
Evaporative Heating Surface (sq ft / m2)952 / 88.44952 / 88.44
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)952 / 88.44952 / 88.44
Evaporative Heating Surface/Cylinder Volume150.99150.99
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation24503063
Same as above plus superheater percentage24503063
Same as above but substitute firebox area for grate area16,24020,650
Power L130623852
Power MT225.02283.07

Reference