Minneapolis & Duluth 0-4-0 "Switcher" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 3/H-1 (Locobase 15818)

Data from NP 1 1929 Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange and DeGolyer, Vol 5, p. 274. Works number was 2537 in August 1871.

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 (65.03 sq m), but given the tube length and count, that would required a very unlikely 243 sq ft (22.5 sq m) of firebox.

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.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID15818
RailroadMinneapolis & Duluth (NP)
Number in Class1
Road Numbers3/69/1070/11
Number Built
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)7 / 2.13
Engine Wheelbase (ft / m)7 / 2.13
Ratio of driving wheelbase to overall engine wheelbase1
Overall Wheelbase (engine & tender) (ft / m)7 / 2.13
Axle Loading (Maximum Weight per Axle) (lbs / kg)39,400 / 17,872
Weight on Drivers (lbs / kg)65,200 / 29,574
Engine Weight (lbs / kg)65,200 / 29,574
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)65,200
Tender Water Capacity (gals / ML)850 / 3.22
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 1.75 / 2
Minimum weight of rail (calculated) (lb/yd / kg/m)54 / 27
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)47.50 / 1207
Boiler Pressure (psi / kPa)120 / 8.30
High Pressure Cylinders (dia x stroke) (in / mm)14" x 22" / 356x559
Tractive Effort (lbs / kg)9259 / 4199.82
Factor of Adhesion (Weight on Drivers/Tractive Effort) 7.04
Heating Ability
Tubes (number - dia) (in / mm)84 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.40 / 3.17
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2) 9.50 / 0.88
Evaporative Heating Surface (sq ft / m2)
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)
Evaporative Heating Surface/Cylinder Volume
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1140
Same as above plus superheater percentage1140
Same as above but substitute firebox area for grate area
Power L1
Power MT

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