Denver & Rio Grande 4-4-0 "American" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 37 (Locobase 1451)

Data from . See also DeGolyer, Volume 7, p. 237. Works numbers 3867, 3869, 3871 in April 1876.

Similar to the Class 40 Mogul, but with a higher-pressure boiler and tall drivers (3'8"). Retired in 1888.

Specifications by Steve Llanso of Sweat House Media
Locobase ID1451
RailroadDenver & Rio Grande (D&RGW)
Number in Class3
Road Numbers16-18
Number Built3
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase 7.17'
Engine Wheelbase18.25'
Ratio of driving wheelbase to overall engine wheebase 0.39
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers
Engine Weight37000 lbs
Tender Light Weight
Total Engine and Tender Weight
Tender Water Capacity1000 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)0
Geometry Relating to Tractive Effort
Driver Diameter45"
Boiler Pressure150 psi
Cylinders (dia x stroke)11" x 16"
Tractive Effort5485 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Firebox Area
Grate Area 7.80 sq. ft
Evaporative Heating Surface
Superheating Surface
Combined Heating Surface0
Evaporative Heating Surface/Cylinder Volume
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1170
Same as above plus superheater percentage1170
Same as above but substitute firebox area for grate area0
Power L10
Power MT


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