New York & Brooklyn Bridge 2-4-2 "Columbian" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 12 (Locobase 5867)

Data from American Engineer & Railroad Journal (AERJ), Volume LXIX, No 10 (October 1895), p. 473. Works numbers were 1579-1580 in April 1895.

The AERJ report describes these little tanks as performing "switching work of the severest kind" which called for a more substantial frame than the dimensions might otherwise indicate. The article also noted the "new device" fitted to the pony trucks at each end of the engine. The device was a set of curved inclined paths up which a pair of rollers would ride as the locomotive entered a curve. The incline encouraged the truck to center itself.

Specifications by Steve Llanso of Sweat House Media
Locobase ID5867
RailroadNew York & Brooklyn Bridge
Number in Class2
Road Numbers12-13
Number Built2
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase5'
Engine Wheelbase18.98'
Ratio of driving wheelbase to overall engine wheebase 0.26
Overall Wheelbase (engine & tender)18.98'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers57400 lbs
Engine Weight79900 lbs
Tender Light Weight
Total Engine and Tender Weight79900 lbs
Tender Water Capacity1000 gals
Tender Fuel Capacity (oil/coal)0.8 tons
Minimum weight of rail (calculated)48 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter42"
Boiler Pressure160 psi
Cylinders (dia x stroke)14" x 18"
Tractive Effort11424 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.02
Heating Ability
Firebox Area61.50 sq. ft
Grate Area15 sq. ft
Evaporative Heating Surface687 sq. ft
Superheating Surface
Combined Heating Surface687 sq. ft
Evaporative Heating Surface/Cylinder Volume214.22
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2400
Same as above plus superheater percentage2400
Same as above but substitute firebox area for grate area9840
Power L13473
Power MT266.78

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