Pontiac, Oxford & Northern 2-6-0 "Mogul" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 10 (Locobase 13062)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 30, p. 133. Works number was 29565 in November 1906.

This Michigan railroad, whose initials earned it the nickname Polly Ann, operated its only Baldwin on the 99 miles of main line between Pontiac and Caseville. It had taken over the assets of the Pontiac, Oxford & Port Austin in 1889. In 1909, the Michigan Railroad Commission described the line as a well-built and maintained; its rail weight was 56 lb/yd (28 kg/metre).

Despite its best efforts, however, as the Polly Ann Trail website ([], down for maintenance in August 2011) explained, it never made much money on passenger service: "Passengers never reached sufficient numbers to support the line, as aside from Pontiac, the communities being serviced were all so sparsely populated. The fertile farmland known for its wheat, bean and sugar beet crops, contributed valuable tonnage to the railroad. It was said that there was always a free bag of beans to be had by the train's crew whenever they had to layover. The term "out to beans" because synonymous with "out to lunch"."

In 1909, the Grand Trunk Western gained control for $400,000 and, among other acts, renumbered the 10 as their 2533 and briefly classified it E-7. In November 1910, the 2533 went to the Detroit, Bay City & Western as their #3. That road was reorganized as the Detroit, Caro & Sandusky in 1925.

Service continued to decline and the "Poor, Old & Neglected" ended its thrice-weekly, mixed-train service in 1955.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID13062
RailroadPontiac, Oxford & Northern
Number in Class1
Road Numbers10
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)15 / 4.57
Engine Wheelbase (ft / m)22.67 / 6.91
Ratio of driving wheelbase to overall engine wheelbase 0.66
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)86,000 / 39,009
Engine Weight (lbs / kg)103,000 / 46,720
Tender Loaded Weight (lbs / kg)80,000 / 36,287
Total Engine and Tender Weight (lbs / kg)183,000 / 83,007
Tender Water Capacity (gals / ML)4000 / 15.15
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)48 / 24
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)56 / 1422
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x610
Tractive Effort (lbs / kg)18,950 / 8595.59
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.54
Heating Ability
Tubes (number - dia) (in / mm)189 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.84 / 3.30
Firebox Area (sq ft / m2)124.80 / 11.60
Grate Area (sq ft / m2)17 / 1.58
Evaporative Heating Surface (sq ft / m2)1204 / 111.90
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1204 / 111.90
Evaporative Heating Surface/Cylinder Volume190.81
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3060
Same as above plus superheater percentage3060
Same as above but substitute firebox area for grate area22,464
Power L14867
Power MT374.30

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