This little shop switcher was delivered as an 0-4-0 trailing a tender that held 1,000 US gallons (3,785 litres) of water. Its boiler contained 87 tubes.
Although the engine was taken into the Northern Pacific when it absorbed the M&D in 1881, it wasn't until 1906 that it was converted into a saddle tank. Its diagram reports that the total heating surface area was at that time 700 sq ft (65 sq m), but given the tube length and count, that would required a very unlikely 243 sq ft (22.5 sq m).
The 1929 diagram shows a long-wheelbase engine with a slender boiler top by a very tall cylindrical dome just ahead of the cab. The large saddle tank obscured a thimble-shaped sand dome.
The 11 remained in service until 1929.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Minneapolis & Duluth (NP)|
|Number in Class||1|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||1|
|Overall Wheelbase (engine & tender)||7'|
|Axle Loading (Maximum Weight per Axle)||39400 lbs|
|Weight on Drivers||65200 lbs|
|Engine Weight||65200 lbs|
|Tender Light Weight|
|Total Engine and Tender Weight||65200 lbs|
|Tender Water Capacity||850 gals|
|Tender Fuel Capacity (oil/coal)||1.75 tons|
|Minimum weight of rail (calculated)||54 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||120 psi|
|Cylinders (dia x stroke)||14" x 22"|
|Tractive Effort||9259 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||7.04|
|Grate Area||9.50 sq. ft|
|Evaporative Heating Surface|
|Combined Heating Surface||0|
|Evaporative Heating Surface/Cylinder Volume|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||1140|
|Same as above plus superheater percentage||1140|
|Same as above but substitute firebox area for grate area||0|