Ashland, Odanah & Marengo 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 14319)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 52, p. 404. See also the summary of Wisconsin logging roads at [] . Works number was 43447 in May 1916.

Up in Northern Wisconsin, the Bad River had a reputation for being just that--bad for transportation. So the J S Stearns Lumber Company incorporated the AO&M to bypass the shallowest sections of the Bad. At first just a log carrier, the AO&M registered as a common carrier in 1905 and finished construction of its 15 miles from Odanah to Echlin by the end of 1906. (Another 15 miles were spurs.) The short distance included 7% grades, curves of 24 degrees (radii of 240 feet/73.1 metres), and 56 lb/yard (28 kg/metre) rail.

Beginning in 1910, the railroad ran mixed trains every day except Sunday. Since the 1915 and 1916 returns to the Railroad Commission of Wisconsin show income only from revenue freight, however, it seems that the service lasted for only a few years.

When Stearns moved its operation across the Mason-Dixon line in 1921, however, the only real reason for the AO&M disappeared along with the rails and the rest of its physical existence.

This small logging Prairie was practically new when the railroad vanished, so it was sold first to Miner Brothers Lumber, then to Mellen Lumber, also in Wisconsin. Mellen sold the engine to locomotive rebuilder/reseller Southern Iron & Equipment in 1928. SI&E soon found a buyer in the Oconto Company, which was the successor to Langlade County's Miner Brothers.

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID14319
RailroadAshland, Odanah & Marengo
Number in Class1
Road Numbers4
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)10.25 / 3.12
Engine Wheelbase (ft / m)26.83 / 8.18
Ratio of driving wheelbase to overall engine wheelbase 0.38
Overall Wheelbase (engine & tender) (ft / m)49.12 / 14.97
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)90,000 / 40,823
Engine Weight (lbs / kg)116,800 / 52,980
Tender Loaded Weight (lbs / kg)80,000 / 36,287
Total Engine and Tender Weight (lbs / kg)196,800 / 89,267
Tender Water Capacity (gals / ML)4000 / 15.15
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)8 / 7
Minimum weight of rail (calculated) (lb/yd / kg/m)50 / 25
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)46 / 1168
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x610
Tractive Effort (lbs / kg)23,070 / 10464.39
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.90
Heating Ability
Tubes (number - dia) (in / mm)200 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)13.75 / 4.19
Firebox Area (sq ft / m2)120 / 11.15
Grate Area (sq ft / m2)18.20 / 1.69
Evaporative Heating Surface (sq ft / m2)1551 / 144.09
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1551 / 144.09
Evaporative Heating Surface/Cylinder Volume245.80
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3276
Same as above plus superheater percentage3276
Same as above but substitute firebox area for grate area21,600
Power L14704
Power MT345.68

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Wes Barris