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


Class Details by Steve Llanso of Sweat House Media

Class K-1 (Locobase 14568)

Data from 1925 and 1950 -3- Rutland Locomotive Diagram book digitized at Middlebury College in Vermont and made available on the Web at http://middarchive.middlebury.edu/cdm/compoundobject/collection/vtbookspamp/id/19372/rec/10 . (Thanks to Chris Hohl for pointing out the valve gear and the lack of tender weight information) Works numbers were 66327-66329 in 1925.

This trio of Pacifics blended characteristics of the two USRA Pacific designs shown in Locobases 172 and 173. From the lighter of the two came the grate and firebox, wheelbase, cylinder volume, and the weight range, while the heavier USRA design contributed the tube and flue count. Different from both government designs, however, was the two additional feet of tube length, which substantially enhanced the superheater ratio.


Class K-2 (Locobase 15903)

Data from 1950 -3- Rutland Locomotive Diagram book. See also Apr 25th, 2013

by RRHS Membership Chairman, " Rutland Railroad Historical Society 80?s and 90?s on the Rutland", Rutland Railroad Historical Society blog archived at http://www.rutlandrr.org/2013/04/25/80s-and-90s-on-the-rutland/, last accessed 23 September 2014. (Thanks to Chris Hohl for his September 2014 email pointing out the absence of this class.) Works numbers were 68052-68054 in October 1929.

Locobase 14568 describes the three modern Pacifics that were derived from the USRA's Light Pacific design. This trio followed four years later with boilers reflecting the growing interest in the Type E superheater, which led to more superheater area, but more maintenance as well.

Taller drivers increased running speed and conferred a graceful profile on the design. Any loss in tractive effort was offset by a 15-psi (1.03 bar) increase in boiler pressure, while the 12" (305 mm) piston valves were big enough for the Rut. Other "special equipment" were the cast-steel locomotive bed, front end American multiple throttle, type BK stoker, Alco reverse goal, Nathan 24-point mechanical lubricator, Cleveland low water alarm, right-hand-side exhaust steam injector.

The RRHS chairman noted the trio's service area and reputation: "These steamers were used throughout the Rutland system and frequently powered the Mount Royal and Green Mountain Flyer trains, as well as time-sensitive milk trains. They were considered a favorite of engine crews." They served the Rutland until 1951-1953.

Specifications by Steve Llanso of Sweat House Media
ClassK-1K-2
Locobase ID14568 15903
RailroadRutland (Rutland)Rutland (Rutland)
CountryUSAUSA
Whyte4-6-24-6-2
Number in Class33
Road Numbers80-8283-85
GaugeStdStd
Number Built33
BuilderAlco-SchenectadyAlco-Schenectady
Year19251929
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase13'13.67'
Engine Wheelbase35.83'35.92'
Ratio of driving wheelbase to overall engine wheebase 0.36 0.38
Overall Wheelbase (engine & tender)71.04'721.20'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers170500 lbs175500 lbs
Engine Weight278000 lbs292500 lbs
Tender Light Weight196800 lbs202300 lbs
Total Engine and Tender Weight474800 lbs494800 lbs
Tender Water Capacity11000 gals11000 gals
Tender Fuel Capacity (oil/coal)14 tons14 tons
Minimum weight of rail (calculated)95 lb/yard98 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter69"73"
Boiler Pressure200 psi215 psi
Cylinders (dia x stroke)25" x 28"25" x 28"
Tractive Effort43116 lbs43810 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.95 4.01
Heating Ability
Firebox Area242 sq. ft234 sq. ft
Grate Area66.70 sq. ft66.70 sq. ft
Evaporative Heating Surface4108 sq. ft3994 sq. ft
Superheating Surface1060 sq. ft1808 sq. ft
Combined Heating Surface5168 sq. ft5802 sq. ft
Evaporative Heating Surface/Cylinder Volume258.24251.07
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1334014341
Same as above plus superheater percentage1614118786
Same as above but substitute firebox area for grate area5856465906
Power L12148235248
Power MT833.311328.35

Reference


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