Denver, Northwestern & Pacific 4-6-0 "Ten-Wheeler" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class 30 (Locobase 16418)

Data from D&SL 1 - 1932 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange collection.

This was the first Ten-wheeler built for the DNW&P and was a typical 4-6-0 of the time. Its piston valves were inboard of the frame.

In June 1927, successor road D&SL superheated the 300 but otherwise left the engine untouched. It served the D&SL for another two decades before being scrapped at the time of the Denver & Rio Grande Western takeover.


Class 34 (Locobase 11472)

Data from "Locomotive Building," The Railway Age Gazette, Vol XLVIII, No 13 (1 April 1910), p. 923.Works number was 48147 in July 1910.

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

Not long before this locomotive entered service, Hugh Boutell wrote about his excursions on Colorado railroads.

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.


Class 34 (Locobase 16419)

Data from D&SL 1 - 1932 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange collection.

Engine 301 had the same tender as the earlier 300 (Locobase 16418), but 302's tender carried half again as much coal fuel and 1,000 US gallons (3,785 litres) more water. This pair rolled on drivers of 8" (203 mm) less diameter, which increased starting tractive effort. Another difference between the two locomotives was the use of inboard piston valves on the 301 and slide valves on the 302.

301 was scrapped in June 1942, but the 302 lasted long enough to receive Denver & Rio Grande Western road number 795 in 1947. The Rio Grande scrapped the 795 in July 1948.

Principal Dimensions by Steve Llanso of Sweat House Media
Class303434
Locobase ID16,418 11,472 16,419
RailroadDenver, Northwestern & Pacific (D&SL)Denver, Northwestern & Pacific (D&SL)Denver, Northwestern & Pacific (D&SL)
CountryUSAUSAUSA
Whyte4-6-04-6-04-6-0
Number in Class112
Road Numbers300303/796301
GaugeStdStdStd
Number Built11
BuilderAlco-SchenectadyAlco-SchenectadyAlco-Schenectady
Year192719101927
Valve GearStephensonWalschaertStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)14.83 / 4.5212.8314.83 / 4.52
Engine Wheelbase (ft / m)25.75 / 7.8523.7525.75 / 7.85
Ratio of driving wheelbase to overall engine wheebase 0.58 0.54 0.58
Overall Wheelbase (engine & tender) (ft / m)56.67 / 17.2759.7556.67 / 17.27
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)142,000 / 64,410149,000 / 67,585142,000 / 64,410
Engine Weight (lbs / kg)186,000 / 84,368200,000 / 90,719189,000 / 85,729
Tender Loaded Weight (lbs / kg)118,800 / 53,887132,400 / 60,056
Total Engine and Tender Weight (lbs / kg)304,800 / 138,255321,400 / 145,785
Tender Water Capacity (gals / ML)6000 / 22.737000 / 26.527000 / 26.52
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)10 / 9.1010 / 9.1015 / 13.60
Minimum weight of rail (calculated) (lb/yd / kg/m)79 / 39.5083 / 41.5079 / 39.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)63 / 160063 / 160055 / 1397
Boiler Pressure (psi / kPa)200 / 13.80200 / 13.80200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)20" x 28" / 508x71120.5" x 28" / 521x71120" x 28" / 508x711
Tractive Effort (lbs / kg)30,222 / 13708.4831,752 / 14402.4834,618 / 15702.48
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.70 4.69 4.10
Heating Ability
Firebox Area (sq ft / m2)178 / 16.54199 / 18.49178 / 16.54
Grate Area (sq ft / m2)49.90 / 4.6452.60 / 4.8949.90 / 4.64
Evaporative Heating Surface (sq ft / m2)2220 / 206.243253 / 302.322202 / 204.57
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2220 / 206.243253 / 302.322202 / 204.57
Evaporative Heating Surface/Cylinder Volume218.05304.12216.28
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation998010,5209980
Same as above plus superheater percentage998010,5209980
Same as above but substitute firebox area for grate area35,60039,80035,600
Power L1641583405568
Power MT298.79370.20259.34

All material Copyright © SteamLocomotive.com
Wes Barris