Monongahela Connecting 0-8-0 "Switcher" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 200 (Locobase 15007)

Data from Roy V Wright (Ed.) 1922 Locomotive Cyclopedia of American Practice, Sixth Edition (New York: Simmons-Boardman Publishing Company, 1922), p. 1000. See also "Switching Locomotives for the Monongahela Connecting RR", Railway and Engineering News, Vol 53 (30 August 1913), p. 830. (Thanks to Chris Hohl for his 24 January 2017 email correcting the valve gear). Works numbers were 5250-5252 in March 1913.

This railroad was a subsidiary of the Jones & Laughlin Steel Company and operated in Pittsburgh. At the time of their delivery, these three eight-coupled switchers were the largest locomotives yet built by H K Porter (also of Pittsburgh). The Security sectional brick arch support included arch tubes that contributed to the direct heating surface area.

The 201 was later sold to the Aliquippa & Southern as their 220.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID15,007
RailroadMonongahela Connecting
Number in Class3
Road Numbers200-202
Number Built3
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)14 / 4.27
Engine Wheelbase (ft / m)14 / 4.27
Ratio of driving wheelbase to overall engine wheebase1
Overall Wheelbase (engine & tender) (ft / m)44 / 13.41
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)195,000 / 88,451
Engine Weight (lbs / kg)195,000 / 88,451
Tender Loaded Weight (lbs / kg)114,000 / 51,710
Total Engine and Tender Weight (lbs / kg)309,000 / 140,161
Tender Water Capacity (gals / ML)5800 / 21.97
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)8 / 7.30
Minimum weight of rail (calculated) (lb/yd / kg/m)81 / 40.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)50 / 1270
Boiler Pressure (psi / kPa)185 / 12.80
High Pressure Cylinders (dia x stroke) (in / mm)23" x 28" / 584x711
Tractive Effort (lbs / kg)46,584 / 21130.17
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.19
Heating Ability
Firebox Area (sq ft / m2)192 / 17.84
Grate Area (sq ft / m2)42 / 3.90
Evaporative Heating Surface (sq ft / m2)2204 / 204.76
Superheating Surface (sq ft / m2)470 / 43.66
Combined Heating Surface (sq ft / m2)2674 / 248.42
Evaporative Heating Surface/Cylinder Volume163.69
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation7770
Same as above plus superheater percentage9169
Same as above but substitute firebox area for grate area41,914
Power L18466
Power MT382.86

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Wes Barris