Maine Central 2-6-6-2 Type Locomotives

Class X (Locobase 6529)

Data from 1923 and 1924 Maine Central locomotive diagrams supplied by Allen Stanley in May 2005 from his extensive collection. These compound Mallets were delivered (works #48648-48651) to the Boston & Maine as oil-burning helpers on the Hoosac Tunnel section. Within 6 months, however, that portion was electrified and the quartet was sold to the Maine Central. The B & M saw them go with few regrets, according to Drury (1993). They had small drivers and an equally small firebox. (The improbable values shown in the specs are clearly visible in the MEC's diagram. The MEC's calculated tractive effort was 61,860 lb.)

On the MEC they served on the Crawford Notch grade in New Hampshire. Within a year they'd been converted to coal burning. Rendered redundant by the introduction of 2-8-2s, the class worked sporadically for years. The three unsuperheated engines were scrapped in 1929, while 1204, which had been superheated during repairs following an accident, lingered until 1934.

Specifications
ClassX
Locobase ID6529
RailroadMaine Central
Whyte2-6-6-2
Road Numbers1201-1204
GaugeStd
BuilderAlco-Schenectady
Year1910
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase11'
Engine Wheelbase48.25'
Ratio of driving wheelbase to overall engine wheebase 0.23
Overall Wheelbase (engine & tender)77'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers262000 lbs
Engine Weight308000 lbs
Tender Light Weight148300 lbs
Total Engine and Tender Weight456300 lbs
Tender Water Capacity7500 gals
Tender Fuel Capacity (oil/coal)12 tons
Minimum weight per yard of rail on which locomotive could run72.78 lb rail
Geometry Relating to Tractive Effort
Driver Diameter61"
Boiler Pressure200 psi
Cylinders (dia x stroke)22" x 30"
Low Pressure Cylinders (dia x stroke)35" x 30"
Tractive Effort58011 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.52
Heating Ability
Firebox Area169 sq. ft
Grate Area49 sq. ft
Evaporative Heating Surface4444
Superheating Surface
Combined Heating Surface4444
Evaporative Heating Surface/Cylinder Volume336.69
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation9800
Same as above plus superheater percentage9800
Same as above but substitute firebox area for grate area33800
Power L13219.21
Power MT162.53

Credits

Introduction and specifications provided by Steve Llanso of Sweat House Media.

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