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
Class34
Locobase ID11,472
RailroadDenver, Northwestern & Pacific (D&SL)
CountryUSA
Whyte4-6-0
Number in Class1
Road Numbers303 / 796
GaugeStd
Number Built1
BuilderAlco-Schenectady
Year1910
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)
Engine Wheelbase (ft)
Ratio of driving wheelbase to overall engine wheebase
Overall Wheelbase (engine & tender) (ft)
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)149,000
Engine Weight (lbs)200,000
Tender Loaded Weight (lbs)
Total Engine and Tender Weight (lbs)
Tender Water Capacity (gals)7000
Tender Fuel Capacity (oil/coal) (gals/tons)10
Minimum weight of rail (calculated) (lb/yd)83
Geometry Relating to Tractive Effort
Driver Diameter (in)63
Boiler Pressure (psi)200
High Pressure Cylinders (dia x stroke) (in)20.5" x 28"
Tractive Effort (lbs)31,752
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.69
Heating Ability
Firebox Area (sq ft)199
Grate Area (sq ft)52.60
Evaporative Heating Surface (sq ft)3253
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)3253
Evaporative Heating Surface/Cylinder Volume304.12
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10,520
Same as above plus superheater percentage10,520
Same as above but substitute firebox area for grate area39,800
Power L18340
Power MT370.20


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