Suncook Valley 2-6-0 "Mogul" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 15339)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 77, pp. 234+. Works number was 59887 in February 1927.

This Mogul's road number is apparently deceptive. After all, the SVRR ran from Suncook (just south of Concord, New Hampshire) northeast through Epsom to Pittsfield, opening that section in 1869 and thence to Center Barnstead. The latter segment of 4.5 miles (7.25 km) was completed only in 1889 as part of an extension to Alton Bay. The actual distance of the railroad measured from Hooksett a total of 24.2 miles (39 km) to Center Barnstead. Trains beginning at Hooksett climbed out of the Concord valley using a switchback to climb the escarpment.

It remained independent only until 1895, when it came under the Boston & Maine's control. Almost thirty years later, the B&M proposed abandoning the entire line, but local interests that prized the "Blueberry Route" (named for once-abundant blueberry bushes) found the money to buy the line from the receptive B&M. The final agreement came on 30 March 1925.

Needing a useful mixed-traffic locomotive, the SVRR bought this relatively common Baldwin type Its route ran on 60 lb/yard (30 kg/metre) on a gentle alignment of no more than 8 degree curves and 1.9% grades.

Once again independent, the SVRR struggled to make money over the next couple of decades, surviving primarily on its mail-contract revenue. The line was forced to end service between Pittsfield and Center Barnstead in 1947. The remainder of the road was abandoned in 1952.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID15,339
RailroadSuncook Valley
Number in Class1
Road Numbers1
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)11.50 / 3.51
Engine Wheelbase (ft / m)19.33 / 5.89
Ratio of driving wheelbase to overall engine wheebase 0.59
Overall Wheelbase (engine & tender) (ft / m)45.54 / 13.88
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)96,000 / 43,545
Engine Weight (lbs / kg)112,000 / 50,802
Tender Loaded Weight (lbs / kg)65,000 / 29,484
Total Engine and Tender Weight (lbs / kg)177,000 / 80,286
Tender Water Capacity (gals / ML)3000 / 11.36
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)6 / 5.50
Minimum weight of rail (calculated) (lb/yd / kg/m)53 / 26.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)52 / 1321
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x610
Tractive Effort (lbs / kg)22,879 / 10377.75
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.20
Heating Ability
Firebox Area (sq ft / m2)103 / 9.57
Grate Area (sq ft / m2)21.30 / 1.98
Evaporative Heating Surface (sq ft / m2)1355 / 125.88
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1355 / 125.88
Evaporative Heating Surface/Cylinder Volume191.69
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3834
Same as above plus superheater percentage3834
Same as above but substitute firebox area for grate area18,540
Power L14127
Power MT284.33

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Wes Barris