Unknown 4-6-2 "Pacific" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class unknown (Locobase 3305)

The data is from a table of locomotives to which James Partington, Estimating Engineer for Alco, compared his company's #50000 in "Avoidable Waste in Locomotive Operation as Affected by Design", Railway Age, Volume 95, No. 11 (5 November 1921), pp. 673-677. He chose not to identify any of these rivals.

Locobase had deduced that this entry was the single K29, but was persuaded by a table in the reproduction of the 1913 Alco Bulletin 1016 on Richard Leonard's http://www.railarchive.net/alcopacifics/index.html (accessed 16 June 2006) that, at least as delivered, this was not that locomotive. Still, many of the characteristics are similar and Locobase wonders if this reflects a later reworking of the K29.

Specifications by Steve Llanso of Sweat House Media
Locobase ID3305
Number in Class1
Road Numbers
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase13.83'
Engine Wheelbase36.50'
Ratio of driving wheelbase to overall engine wheebase 0.38
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers201800 lbs
Engine Weight308900 lbs
Tender Light Weight
Total Engine and Tender Weight
Tender Water Capacity
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)112 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter80"
Boiler Pressure205 psi
Cylinders (dia x stroke)27" x 28"
Tractive Effort44460 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.54
Heating Ability
Firebox Area288.60 sq. ft
Grate Area70 sq. ft
Evaporative Heating Surface4035 sq. ft
Superheating Surface1154 sq. ft
Combined Heating Surface5189 sq. ft
Evaporative Heating Surface/Cylinder Volume217.46
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation14350
Same as above plus superheater percentage17507
Same as above but substitute firebox area for grate area72179
Power L123369
Power MT765.90

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