South Manchester 0-4-4 "Forney" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class Mt Nebo (Locobase 11752)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 9, p. 102. Baldwin works number was 4632 in May 1879.

This long-legged wood-burning Forney-type tank engine was ordered by the Cheney Brothers, but was sold to the SMRR upon delivery; this street railway connected South Manchester, Conn with North Manchester over a 2 1/4 route . It later worked for the Case Paper Company.

Specifications by Steve Llanso of Sweat House Media
ClassMt Nebo
Locobase ID11,752
RailroadSouth Manchester
Number in Class1
Road Numbers
Number Built1
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft) 6.50
Engine Wheelbase (ft)17.50
Ratio of driving wheelbase to overall engine wheebase 0.37
Overall Wheelbase (engine & tender) (ft)17.50
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)34,000
Engine Weight (lbs)48,000
Tender Loaded Weight (lbs)
Total Engine and Tender Weight (lbs)48,000
Tender Water Capacity (gals)650
Tender Fuel Capacity (oil/coal) (gals/tons)
Minimum weight of rail (calculated) (lb/yd)28
Geometry Relating to Tractive Effort
Driver Diameter (in)43
Boiler Pressure (psi)130
High Pressure Cylinders (dia x stroke) (in)12" x 18"
Tractive Effort (lbs)6661
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.10
Heating Ability
Firebox Area (sq ft)50
Grate Area (sq ft)10.30
Evaporative Heating Surface (sq ft)448
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)448
Evaporative Heating Surface/Cylinder Volume190.14
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1339
Same as above plus superheater percentage1339
Same as above but substitute firebox area for grate area6500
Power L12760
Power MT357.93