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 (ft) 7.50
Engine Wheelbase (ft)24.25
Ratio of driving wheelbase to overall engine wheebase 0.31
Overall Wheelbase (engine & tender) (ft)50.94
Axle Loading (Maximum Weight per Axle) (lbs)46,000
Weight on Drivers (lbs)86,200
Engine Weight (lbs)138,000
Tender Loaded Weight (lbs)90,000
Total Engine and Tender Weight (lbs)228,000
Tender Water Capacity (gals)4000
Tender Fuel Capacity (oil/coal) (gals/tons) 6.70
Minimum weight of rail (calculated) (lb/yd)72
Geometry Relating to Tractive Effort
Driver Diameter (in)84.50
Boiler Pressure (psi)200
High Pressure Cylinders (dia x stroke) (in)19" x 26"
Tractive Effort (lbs)18,883
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.56
Heating Ability
Firebox Area (sq ft)187.64
Grate Area (sq ft)44.47
Evaporative Heating Surface (sq ft)1580
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)1580
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 area37,528
Power L18313
Power MT425.22


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