Detroit, Bay City & Alpena 2-4-0 "Porter" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 12 (Locobase 11852)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 13, p. 83. Works number was 8058 in July 1886

Begun as a 38"-gauge railroad, but widened to standard gauge even as this little locomotive was ordred, the DBC & A was the first common-carrier railroad to serve the northern Michigan city of Alpena. It connected two Lake Huron towns 47 miles apart: Bay City, at the curve between Michigan's "thumb" and the (left) "mitten", and Alpena, near the top of the "index finger" in the mitten. Including its other lines, the total measured 83 miles, all of which was standard gauge by the end of 1886.

Falling into receivership in 1893, as many railroads did during that Panic year, the DBC & A reemerged as the Detroit & Mackinac Railway.

Specifications by Steve Llanso of Sweat House Media
Locobase ID11,852
RailroadDetroit, Bay City & Alpena
Number in Class1
Road Numbers12
Number Built1
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft) 7.50
Engine Wheelbase (ft)15.17
Ratio of driving wheelbase to overall engine wheebase 0.49
Overall Wheelbase (engine & tender) (ft)
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)43,000
Engine Weight (lbs)52,000
Tender Loaded Weight (lbs)
Total Engine and Tender Weight (lbs)
Tender Water Capacity (gals)1600
Tender Fuel Capacity (oil/coal) (gals/tons)
Minimum weight of rail (calculated) (lb/yd)36
Geometry Relating to Tractive Effort
Driver Diameter (in)44
Boiler Pressure (psi)140
High Pressure Cylinders (dia x stroke) (in)14" x 22"
Tractive Effort (lbs)11,662
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.69
Heating Ability
Firebox Area (sq ft)76
Grate Area (sq ft)15
Evaporative Heating Surface (sq ft)690
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)690
Evaporative Heating Surface/Cylinder Volume176.03
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2100
Same as above plus superheater percentage2100
Same as above but substitute firebox area for grate area10,640
Power L12803
Power MT287.42

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