Chicago, Burlington & Quincy 2-4-2 "Columbian" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class N-1 (Locobase 423)

Data from Corbin & Kerka (1960), p. 84. See also Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 20, p. 16 and Engineering News December 1895 extract from, Works number was 14410 in August 1895.

Relatively small, high-pitched boiler on a bar frame; (254 mm) piston valves worked by inside Stephenson link.

One of few engines of this wheel arrangement to enter service. Baldwin's weight estimates

Corbin & Kerka note that the boiler was rebuilt in 1897 to eliminate the combustion chamber, which had not functioned as planned. All the tubes were replaced with ones that measured 13' 2 1/4" (4.02 m). Also, the wide firebox was replaced by one that was 36 1/4" wide and yielded 31.8 sq ft (2.95 sq m) in grate area.

The N-1 was later rebuilt as a 4-4-2 Atlantic; see Locobase 5453.

Specifications by Steve Llanso of Sweat House Media
Locobase ID423
RailroadChicago, Burlington & Quincy (CB&Q)
Number in Class1
Road Numbers590/1590/2400/2599
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase 7.50'
Engine Wheelbase24.25'
Ratio of driving wheelbase to overall engine wheebase 0.31
Overall Wheelbase (engine & tender)50.94'
Axle Loading (Maximum Weight per Axle)46000 lbs
Weight on Drivers86200 lbs
Engine Weight138000 lbs
Tender Light Weight90000 lbs
Total Engine and Tender Weight228000 lbs
Tender Water Capacity4000 gals
Tender Fuel Capacity (oil/coal)6.7 tons
Minimum weight of rail (calculated)72 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter84.50"
Boiler Pressure200 psi
Cylinders (dia x stroke)19" x 26"
Tractive Effort18883 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.56
Heating Ability
Firebox Area187.64 sq. ft
Grate Area44.47 sq. ft
Evaporative Heating Surface1580 sq. ft
Superheating Surface
Combined Heating Surface1580 sq. ft
Evaporative Heating Surface/Cylinder Volume185.18
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation8894
Same as above plus superheater percentage8894
Same as above but substitute firebox area for grate area37528
Power L18313
Power MT425.22


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