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

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 Raildata collection.

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 8.50'
Engine Wheelbase23.92'
Ratio of driving wheelbase to overall engine wheebase 0.36
Overall Wheelbase (engine & tender)62.91'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers98500 lbs
Engine Weight144500 lbs
Tender Light Weight124300 lbs
Total Engine and Tender Weight268800 lbs
Tender Water Capacity5500 gals
Tender Fuel Capacity (oil/coal)12 tons
Minimum weight of rail (calculated)82 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter69"
Boiler Pressure200 psi
Cylinders (dia x stroke)19.5" x 26"
Tractive Effort24358 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.04
Heating Ability
Firebox Area191 sq. ft
Grate Area30.10 sq. ft
Evaporative Heating Surface2007 sq. ft
Superheating Surface
Combined Heating Surface2007 sq. ft
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 area38200
Power L17580
Power MT339.31

If you have any railroad data such as diagram books, rail station plans or anything else that you would be willing to share, please contact us.