Memphis, Dallas & Gulf 4-4-0 "American" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 300 (Locobase 6637)

Data from 1919 MD & G locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

By the time this locomotive was built, its grate and boiler size was considerably smaller than average.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID6637
RailroadMemphis, Dallas & Gulf
Number in Class1
Road Numbers300
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 8.12 / 2.47
Engine Wheelbase (ft / m)20.96 / 6.39
Ratio of driving wheelbase to overall engine wheebase 0.39
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)60.50 / 1537
Boiler Pressure (psi / kPa)150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)16" x 24" / 406x610
Tractive Effort (lbs / kg)12,948 / 5873.12
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Firebox Area (sq ft / m2)98 / 9.11
Grate Area (sq ft / m2)15.32 / 1.42
Evaporative Heating Surface (sq ft / m2)863 / 80.20
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)863 / 80.20
Evaporative Heating Surface/Cylinder Volume154.52
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2298
Same as above plus superheater percentage2298
Same as above but substitute firebox area for grate area14,700
Power L13664
Power MT

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