Pittsburgh, McKeesport & Youghiogheny 2-8-0 "Consolidation" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 271 (Locobase 2438)

Data provided by reprint of FMIG #28, a Frisco Lines newsletter, at [] (accessed 22 August 2005). Data from StLSF 1904, StLSF 1908 description, and SL&SF All Time Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

Builder information from B Rumary list supplied by Allen Stanley in March 2004. Works numbers were 1756-1759 (December 1897-January 1898) and 1939-1945 (June 1899).

Although the data come from the St Louis-San Francisco era, the locomotives started out on the PM &Y. They were taken up by the New York Central and renumbered 9400-9410. The Pittsburgh & Lake Erie locomotives (121 et seq) later taken in the NYC as the 9300-9314 (Locobase 7072) were of the same design.

Rumary details the 9400 class's subsequent dispositions.

Successor roads ranged as widely as the Moon Run/Montour in Pennsylvania to the Muscle Shoals, Birmingham & Pensacola in Alabama to the St Louis-San Francisco to the Montana, Wyoming & Southern. Scotts Run railroad had fivefrom a variety of orders.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID2438
RailroadPittsburgh, McKeesport & Youghiogheny
Number in Class11
Road Numbers271-281/870-871
Number Built11
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)14.67 / 4.47
Engine Wheelbase (ft / m)22.67 / 6.91
Ratio of driving wheelbase to overall engine wheebase 0.65
Overall Wheelbase (engine & tender) (ft / m)52.10 / 15.88
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)142,000 / 64,410
Engine Weight (lbs / kg)157,500 / 71,441
Tender Loaded Weight (lbs / kg)111,700 / 50,666
Total Engine and Tender Weight (lbs / kg)269,200 / 122,107
Tender Water Capacity (gals / ML)4600 / 17.42
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT) 9.60 / 8.70
Minimum weight of rail (calculated) (lb/yd / kg/m)59 / 29.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)51 / 1295
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)20" x 26" / 508x660
Tractive Effort (lbs / kg)31,200 / 14152.10
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.55
Heating Ability
Firebox Area (sq ft / m2)162.50 / 15.10
Grate Area (sq ft / m2)25.50 / 2.37
Evaporative Heating Surface (sq ft / m2)1800 / 167.22
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1800 / 167.22
Evaporative Heating Surface/Cylinder Volume190.40
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4590
Same as above plus superheater percentage4590
Same as above but substitute firebox area for grate area29,250
Power L14228
Power MT262.57

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