Dominion Atlantic 4-6-0 Locomotives in Canada


Class Details by Steve Llanso of Sweat House Media

Class Blomidon (Locobase 13172)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 30, p. 282. See also the Dominion Atlantic Railway Digital Preservation Initiative - Wiki at [link], last accessed 25 December 2013. (Thanks to Steve Meredith of the DARDPI for his 24 December 2013 email querying the two 4-4-0 entries then in Locobase.). Works numbers were 31847 in October 1907 and 32258 in November.

Complementing the single Baldwin Eight-wheeler from 1903 (Locobase 11514) was this brace of Ten-wheelers that were bigger in most dimensions. They had the same number of boiler tubes, but each was 4 feet longer. Driver diameter was smaller, cylinder volume greater, and boiler pressure higher, so the Blomidon and her sister Glooscap laid down a third more starting tractive effort.

Both engines served the DA Rwy for their entire careers. Blomidon's Wiki entry at [link] comments on some detail changes during its career: "It is interesting in the Gallery photos below to watch the progression of the front pilot and pilot trucks. As a new loco, No. 32 sports 8 spoked wheels on the front and rear of the pilot and a long extended pilot but by the end of her career she has solid pilot wheels front and back and a short snub pilot."

Glooscap (named for the "heroic spirtual figure of Nova Scotia's Mi'kmaq people") was seriously damaged in a wreck near Hantsport in 1919. The Wiki entry adds that " After the CPR takeover which brought larger ten wheelers to the DAR, No. 33 and 32 were frequently used on the Kentville-Kingsport run pulling the School Trains."

Glooscap was scrapped in 1934 and Blomidon by 1941.

Principal Dimensions by Steve Llanso of Middle Run Media
ClassBlomidon
Locobase ID13172
RailroadDominion Atlantic
CountryCanada
Whyte4-6-0
Number in Class2
Road Numbers32-33
GaugeStd
Number Built2
BuilderBurnham, Williams & Co
Year1907
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)11.50 / 3.51
Engine Wheelbase (ft / m)22 / 6.71
Ratio of driving wheelbase to overall engine wheelbase 0.52
Overall Wheelbase (engine & tender) (ft / m)48.40 / 14.75
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)95,500 / 43,318
Engine Weight (lbs / kg)121,000 / 54,885
Tender Loaded Weight (lbs / kg)76,000 / 34,473
Total Engine and Tender Weight (lbs / kg)197,000 / 89,358
Tender Water Capacity (gals / ML)3800 / 14.39
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)7 / 6
Minimum weight of rail (calculated) (lb/yd / kg/m)53 / 26.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)60 / 1524
Boiler Pressure (psi / kPa)200 / 1380
High Pressure Cylinders (dia x stroke) (in / mm)19" x 24" / 483x610
Tractive Effort (lbs / kg)24,548 / 11134.80
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.89
Heating Ability
Tubes (number - dia) (in / mm)256 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)13.25 / 4.04
Firebox Area (sq ft / m2)132 / 12.27
Grate Area (sq ft / m2)28 / 2.60
Evaporative Heating Surface (sq ft / m2)1898 / 176.39
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1898 / 176.39
Evaporative Heating Surface/Cylinder Volume240.86
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5600
Same as above plus superheater percentage5600
Same as above but substitute firebox area for grate area26,400
Power L16492
Power MT449.60

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