Chicago & Northern Pacific 2-6-6 Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 24 (Locobase 9618)

Data from Catalogue Descriptive of Simple and Compound Locomotives built by Brooks Locomotive Works, Dunkirk, NY (Buffalo, NY: Matthew-Northrup Company, 1899) and builder info from B.Rumary, 25 Kingscombe, Gurney Slade, Radstock, BA3 4TH, ENGLAND and Jeremy Lambert as supplied by Allen Stanley in March 2004. Works number was 2264.

As noted in Locobase 2912, the C & NP conducted commuter operations out of Chicago. Built for display at the Columbian Exposition, the engine had unusually large coal bunkers. The firebox heating surface included 23 sq ft of arch "pipes" (usually described as arch tubes).

Specifications by Steve Llanso of Sweat House Media
Locobase ID9618
RailroadChicago & Northern Pacific
Number in Class1
Road Numbers24
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)15
Engine Wheelbase (ft)35.75
Ratio of driving wheelbase to overall engine wheebase 0.42
Overall Wheelbase (engine & tender) (ft)35.75
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)102,000
Engine Weight (lbs)166,000
Tender Loaded Weight (lbs)
Total Engine and Tender Weight (lbs)166,000
Tender Water Capacity (gals)2600
Tender Fuel Capacity (oil/coal) (gals/tons) 4.50
Minimum weight of rail (calculated) (lb/yd)57
Geometry Relating to Tractive Effort
Driver Diameter (in)63
Boiler Pressure (psi)180
High Pressure Cylinders (dia x stroke) (in)18" x 24"
Tractive Effort (lbs)18,885
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.40
Heating Ability
Firebox Area (sq ft)167
Grate Area (sq ft)22.60
Evaporative Heating Surface (sq ft)1620
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)1620
Evaporative Heating Surface/Cylinder Volume229.18
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4068
Same as above plus superheater percentage4068
Same as above but substitute firebox area for grate area30,060
Power L16564
Power MT425.62

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