Mexican Central 2-6-6-2 Type Locomotives

Class HR-2 (Locobase 5715)

Data from December 1908 American Engineer & Railroad Engineer (AERJ), which noted that this locomotive was very similar to the pushers delivered to the Great Northern in 1906. The Tamasopo Division was curvy (15-22 deg), steep (up to 3% grades), and relatively lightly laid (85-lb rail).

Mexican Central followed this singleton with an order for 20 more in 1910-1911, which suggests that this was a successful prototype.

Specifications
ClassHR-2
Locobase ID5715
RailroadMexican Central (NdeM)
Whyte2-6-6-2
Road Numbers2003
GaugeStd
BuilderBurnham, Williams & Co
Year1908
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase 9.17'
Engine Wheelbase44.17'
Ratio of driving wheelbase to overall engine wheebase 0.21
Overall Wheelbase (engine & tender)70.92'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers300000 lbs
Engine Weight338000 lbs
Tender Light Weight157000 lbs
Total Engine and Tender Weight495000 lbs
Tender Water Capacity9000 gals
Tender Fuel Capacity (oil/coal)3500 gals
Minimum weight per yard of rail on which locomotive could run83.33 lb rail
Geometry Relating to Tractive Effort
Driver Diameter55"
Boiler Pressure200 psi
Cylinders (dia x stroke)21.5" x 32"
Low Pressure Cylinders (dia x stroke)33" x 32"
Tractive Effort64193 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.67
Heating Ability
Firebox Area201 sq. ft
Grate Area61 sq. ft
Evaporative Heating Surface4512
Superheating Surface
Combined Heating Surface4512
Evaporative Heating Surface/Cylinder Volume335.56
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation12200
Same as above plus superheater percentage12200
Same as above but substitute firebox area for grate area40200
Power L13192.94
Power MT140.78

Credits

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

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