Denver, Northwestern & Pacific 4-6-0 "Ten-wheeler" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 34 (Locobase 11472)

Data from "Locomotive Building," The Railway Age Gazette, Vol XLVIII, No 13 (1 April 1910), p. 923.

This Ten-wheeler was the one mixed-traffic Ten-wheeler on the DNW & P with Walschaert outside radial valve gear. Equipment suppliers included:

Axles Otis Steel

Bell ringer Trojan

Boiler lagging Sectional magnesia

Brakes Westinghouse

Brake-beams 'Creco"

Brick arch American Locomotive Equipment Co.

Couplers Sharon

Fire doors Franklin

Headlight Pyle-National

Injector Nathan Mfg. Co.

Journal bearings More Jones Co.

Piston and valve rod packing Paxton-Mltchell

Safety valve Ashton

Sanding devices Leach

Sight-feed lubricators Nathan Mfg. Co.

Springs Uallway Steel-Spring Co.

Steam gages Ashton

Steam heat equipment Safety Car Heating & Ltg. Co.

Tires Latrobe

Tubes Worth Bros.

It operated on the railroad (renamed Denver & Salt Lake) until 1948.

Specifications by Steve Llanso of Sweat House Media
Locobase ID11472
RailroadDenver, Northwestern & Pacific (D&SL)
Number in Class1
Road Numbers303 / 796
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase
Engine Wheelbase
Ratio of driving wheelbase to overall engine wheebase
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers149000 lbs
Engine Weight200000 lbs
Tender Light Weight
Total Engine and Tender Weight
Tender Water Capacity7000 gals
Tender Fuel Capacity (oil/coal)10 tons
Minimum weight of rail (calculated)83 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter63"
Boiler Pressure200 psi
Cylinders (dia x stroke)20.5" x 28"
Tractive Effort31752 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.69
Heating Ability
Firebox Area199 sq. ft
Grate Area52.60 sq. ft
Evaporative Heating Surface3253 sq. ft
Superheating Surface
Combined Heating Surface3253 sq. ft
Evaporative Heating Surface/Cylinder Volume304.12
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10520
Same as above plus superheater percentage10520
Same as above but substitute firebox area for grate area39800
Power L18340
Power MT370.20

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