Chicago & Northern Pacific 2-6-6 Locomotives in 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).

Principal Dimensions 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 / m)15 / 4.57
Engine Wheelbase (ft / m)35.75 / 10.90
Ratio of driving wheelbase to overall engine wheebase 0.42
Overall Wheelbase (engine & tender) (ft / m)35.75 / 10.90
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)102,000 / 46,266
Engine Weight (lbs / kg)166,000 / 75,296
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)166,000
Tender Water Capacity (gals / ML)2600 / 9.85
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT) 4.50 / 4.10
Minimum weight of rail (calculated) (lb/yd / kg/m)57 / 28.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)63 / 1600
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x610
Tractive Effort (lbs / kg)18,885 / 8566.10
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.40
Heating Ability
Firebox Area (sq ft / m2)167 / 15.52
Grate Area (sq ft / m2)22.60 / 2.10
Evaporative Heating Surface (sq ft / m2)1620 / 150.56
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1620 / 150.56
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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Wes Barris