John Souther 4-4-0 "American" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 15" cylinders (Locobase 8812)

Data from Zerah Colburn, The Locomotive Engine (1851). Boiler pressure is an estimate.

Souther left Hinkley's works in 1848 (just as it was being renamed Boston Locomotive Works) to start his own shop in South Boston. It was later (1854) incorporated as the Globe Works; this was around the same time that Souther also managed the Tredegar Works in Richmond. The Globe Works burned down in a fire in 1860.

In addition to boiler details, Colburn also gave the following data:

Size of steam ports 9 7/8 x 1"

Size of exhaust ports 9 7/8 x 1 1/4".

Principal Dimensions by Steve Llanso of Sweat House Media

Class15" cylinders
Locobase ID8812
RailroadJohn Souther
Number in Class
Road Numbers
Number Built
BuilderJohn Souther
Valve Gear
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)66 / 1676
Boiler Pressure (psi / kPa)80 / 5.50
High Pressure Cylinders (dia x stroke) (in / mm)15" x 20" / 381x508
Tractive Effort (lbs / kg)4636 / 2102.86
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)135 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.50 / 3.20
Firebox Area (sq ft / m2)60.80 / 5.65
Grate Area (sq ft / m2) 9.63 / 0.89
Evaporative Heating Surface (sq ft / m2)710 / 65.99
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)710 / 65.99
Evaporative Heating Surface/Cylinder Volume173.59
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation770
Same as above plus superheater percentage770
Same as above but substitute firebox area for grate area4864
Power L12182
Power MT

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Wes Barris