South Manchester 0-4-4 "Forney" Locomotives in 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
CountryUSA
Whyte0-4-4T
Number in Class1
Road Numbers
GaugeStd
Number Built1
BuilderBurnham, Parry, Williams & Co
Year1879
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 6.50 / 1.98
Engine Wheelbase (ft / m)17.50 / 5.33
Ratio of driving wheelbase to overall engine wheebase 0.37
Overall Wheelbase (engine & tender) (ft / m)17.50 / 5.33
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)34,000 / 15,422
Engine Weight (lbs / kg)48,000 / 21,772
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)48,000
Tender Water Capacity (gals / ML)650 / 2.46
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)28 / 14
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)43 / 1092
Boiler Pressure (psi / kPa)130 / 9
High Pressure Cylinders (dia x stroke) (in / mm)12" x 18" / 305x457
Tractive Effort (lbs / kg)6661 / 3021.38
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.10
Heating Ability
Firebox Area (sq ft / m2)50 / 4.65
Grate Area (sq ft / m2)10.30 / 0.96
Evaporative Heating Surface (sq ft / m2)448 / 41.64
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)448 / 41.64
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