Buffalo & St. Marys 2-8-0 "Consolidation" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 7 (Locobase 2631)

Data from Catalogue Descriptive of Simple and Compound Locomotives built by Brooks Locomotive Works, Dunkirk, NY (Buffalo, NY: Matthew-Northrup Company, 1899). Works numbers were 2663-2664 in May 1896.

Builder info from B.Rumary, 25 Kingscombe, Gurney Slade, Radstock, BA3 4TH, ENGLAND and Jeremy Lambert as supplied by Allen Stanley in March 2004.

Within a year of their delivery, these two 2-8-0s were relettered for the Buffalo, St.Mary's and SouthWestern to which Brooks sold a Mogul in the next year (Locobase 2611). Like the 2-6-0, the Consolidations for this railroad had a crown bar, wagon top boiler with steam dome just ahead of the clerestory cab. It offered considerably more heating surface and grate area than the Mogul by adding flues; flue length was virtually identical. Adding an axle allowed more adhesion weight for the same axle loading, which compensated for the effect on starting tractive effort of a 34% increase in cylinder volume.

These took Pittsburgh, Shawmut & Northern road numbers 44 & 45 when the PS & N absorbed several western New York roads in 1899. Designated class H-2, the 7 served the line for more than two decades before being scrapped in December 1924. The 9 followed in July 1925.

Specifications by Steve Llanso of Sweat House Media
Locobase ID2631
RailroadBuffalo & St. Marys
Number in Class2
Road Numbers7, 9
Number Built2
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase14.67'
Engine Wheelbase22.67'
Ratio of driving wheelbase to overall engine wheebase 0.65
Overall Wheelbase (engine & tender)50.33'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers142000 lbs
Engine Weight158750 lbs
Tender Light Weight86000 lbs
Total Engine and Tender Weight244750 lbs
Tender Water Capacity4000 gals
Tender Fuel Capacity (oil/coal)8.5 tons
Minimum weight of rail (calculated)59 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter51"
Boiler Pressure180 psi
Cylinders (dia x stroke)20" x 26"
Tractive Effort31200 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.55
Heating Ability
Firebox Area196 sq. ft
Grate Area28.20 sq. ft
Evaporative Heating Surface1961 sq. ft
Superheating Surface
Combined Heating Surface1961 sq. ft
Evaporative Heating Surface/Cylinder Volume207.43
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5076
Same as above plus superheater percentage5076
Same as above but substitute firebox area for grate area35280
Power L14760
Power MT295.61

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