Maine Central 2-6-0 "Mogul" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class 76 (Locobase 11145)

Data from Schenectady Locomotive Works, Illustrated Catalogue of Simple and Compound Locomotives (Philadelphia: J B Lippincott, 1897), pp. 136-137.

Placing the firebox between the last two axles accounted for this Mogul's long wheelbase.


Class M (Locobase 5868)

Data from American Engineer and Railroad Journal (AERJ) of March 1896.

Firebox heating surface included 20.51 sq ft of arch tubes.

Amos Pillsbury's specifications were met most satisfactorily by the Schenectady Works, according to the AERJ report: "[The design] has a large grate and ample heating surface," noted the author, "and is proving to be an excellent steamer." They were also "light on fuel."

AERJ later commented on the cylinder size and the relatively tall drivers for the time. The piston rods came through the end of the cylinder, a notable practice that had contributed to a "considerable" savings in wear. About the drivers, the journal commented that "the use of comparatively large drivers on freight engines is a move in the right direction."

Specifications by Steve Llanso of Sweat House Media
Class76M
Locobase ID11,145 5868
RailroadMaine Central (MEC)Maine Central (MEC)
CountryUSAUSA
Whyte2-6-02-6-0
Number in Class12
Road Numbers76244-245
GaugeStdStd
Number Built12
BuilderSchenectadySchenectady
Year18891894
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)16.2514.67
Engine Wheelbase (ft)23.9222.25
Ratio of driving wheelbase to overall engine wheebase 0.68 0.66
Overall Wheelbase (engine & tender) (ft)45.7947.61
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)99,700117,600
Engine Weight (lbs)115,800136,600
Tender Loaded Weight (lbs)156,000
Total Engine and Tender Weight (lbs)292,600
Tender Water Capacity (gals)36004000
Tender Fuel Capacity (oil/coal) (gals/tons)8
Minimum weight of rail (calculated) (lb/yd)5565
Geometry Relating to Tractive Effort
Driver Diameter (in)6263
Boiler Pressure (psi)160160
High Pressure Cylinders (dia x stroke) (in)19" x 26"19" x 26"
Tractive Effort (lbs)20,58920,262
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.84 5.80
Heating Ability
Firebox Area (sq ft)148.20175.54
Grate Area (sq ft)18.2625.96
Evaporative Heating Surface (sq ft)16102172
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)16102172
Evaporative Heating Surface/Cylinder Volume188.70254.57
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation29224154
Same as above plus superheater percentage29224154
Same as above but substitute firebox area for grate area23,71228,086
Power L145566005
Power MT302.23337.72

Reference


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