Huntington & Broad Top Mountain 4-6-0 "Ten-wheeler" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 27 (Locobase 12431)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 23, p. 64. Works number was 17925 in July 1900

Like most of the H & BTM motive power, the 27 spent all of its career on its original railroad. It was a big mixed-traffic Ten-wheeler.

Class 35 (Locobase 14687)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 65, p. 152. Works numbers were 55031-55032 in September 1921.

The previous Baldwin Ten-wheeler on this road was the 27, delivered in 1900 (Locobase 12431). These two engines were a full generation or two younger and were ticketed for the H&BTM's passenger service. The addition of a superheater, together with a slightly higher boiler pressure and no signficant change in cylinder volume, more than offset the effect of taller drivers on tractive effort. The valve gear moved outside the frames and actuated 12" (305 mm) piston valves. The firebox's heating surface area included 18 sq ft (1.7 sq m) in three arch tubes.

35's career on the H&BTM was relatively short; the railroad sold it to the Susquehanna & New York in 1934 as their 119. After eight years on that road, the 119 moved on to the Clarion River of Hallton, Pa. Nine years later, the CRRR scrapped the 119 in 1951.

The 36 served H&BTM considerably longer, only being sold to the Canada & Gulf Terminal in 1948. After six more years of service, the engine was scrapped in 1954.

Specifications by Steve Llanso of Sweat House Media
Locobase ID12,431 14,687
RailroadHuntington & Broad Top MountainHuntington & Broad Top Mountain
Number in Class12
Road Numbers2735-36
Number Built12
BuilderBurnham, Williams & CoBaldwin
Valve GearStephensonWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)1513.50
Engine Wheelbase (ft)26.8324.25
Ratio of driving wheelbase to overall engine wheebase 0.56 0.56
Overall Wheelbase (engine & tender) (ft)56.04
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)116,000127,000
Engine Weight (lbs)156,000167,000
Tender Loaded Weight (lbs)120,000133,000
Total Engine and Tender Weight (lbs)276,000300,000
Tender Water Capacity (gals)60007000
Tender Fuel Capacity (oil/coal) (gals/tons)10
Minimum weight of rail (calculated) (lb/yd)6471
Geometry Relating to Tractive Effort
Driver Diameter (in)6366
Boiler Pressure (psi)180190
High Pressure Cylinders (dia x stroke) (in)20" x 28"21" x 26"
Tractive Effort (lbs)27,20028,057
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.26 4.53
Heating Ability
Firebox Area (sq ft)173186
Grate Area (sq ft)32.6046.70
Evaporative Heating Surface (sq ft)26411987
Superheating Surface (sq ft)489
Combined Heating Surface (sq ft)26412476
Evaporative Heating Surface/Cylinder Volume259.40190.64
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation58688873
Same as above plus superheater percentage586810,648
Same as above but substitute firebox area for grate area31,14042,408
Power L1650814,674
Power MT371.06764.19