Minneapolis & St Louis 4-4-0 "American" Locomotives in the USA

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Class Details by Steve Llanso of Sweat House Media

Class D9-24 (Locobase 9020)

Data from M&StL 1934 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

Serviceable passenger engines for the light-density network operated by the M & St L. Their Stephenson valve gear and slide valves remained unchanged until their retirements in 1937.

Specifications by Steve Llanso of Sweat House Media
Locobase ID9020
RailroadMinneapolis & St Louis (MSL)
Number in Class2
Road Numbers115-116/156-157
Number Built2
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 8.50 / 2.59
Engine Wheelbase (ft / m)23.92 / 7.29
Ratio of driving wheelbase to overall engine wheebase 0.36
Overall Wheelbase (engine & tender) (ft / m)62.91 / 19.17
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)98,500 / 44,679
Engine Weight (lbs / kg)144,500 / 65,544
Tender Loaded Weight (lbs / kg)124,300 / 56,382
Total Engine and Tender Weight (lbs / kg)268,800 / 121,926
Tender Water Capacity (gals / ML)5500 / 20.83
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)12 / 10.90
Minimum weight of rail (calculated) (lb/yd / kg/m)82 / 41
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)69 / 1753
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)19.5" x 26" / 495x660
Tractive Effort (lbs / kg)24,358 / 11048.62
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.04
Heating Ability
Firebox Area (sq ft / m2)191 / 17.75
Grate Area (sq ft / m2)30.10 / 2.80
Evaporative Heating Surface (sq ft / m2)2007 / 186.52
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2007 / 186.52
Evaporative Heating Surface/Cylinder Volume223.32
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation6020
Same as above plus superheater percentage6020
Same as above but substitute firebox area for grate area38,200
Power L17580
Power MT339.31