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.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 7 |
| Locobase ID | 2631 |
| Railroad | Buffalo & St. Marys |
| Country | USA |
| Whyte | 2-8-0 |
| Number in Class | 2 |
| Road Numbers | 7, 9 |
| Gauge | Std |
| Number Built | 2 |
| Builder | Brooks |
| Year | 1896 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 14.67 / 4.47 |
| Engine Wheelbase (ft / m) | 22.67 / 6.91 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.65 |
| Overall Wheelbase (engine & tender) (ft / m) | 50.33 / 15.34 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 142,000 / 64,410 |
| Engine Weight (lbs / kg) | 158,750 / 72,008 |
| Tender Loaded Weight (lbs / kg) | 86,000 / 39,009 |
| Total Engine and Tender Weight (lbs / kg) | 244,750 / 111,017 |
| Tender Water Capacity (gals / ML) | 4000 / 15.15 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 8.50 / 8 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 59 / 29.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 51 / 1295 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 20" x 26" / 508x660 |
| Tractive Effort (lbs / kg) | 31,200 / 14152.10 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.55 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 308 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 11.11 / 3.39 |
| Firebox Area (sq ft / m2) | 196 / 18.22 |
| Grate Area (sq ft / m2) | 28.20 / 2.62 |
| Evaporative Heating Surface (sq ft / m2) | 1961 / 182.25 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1961 / 182.25 |
| Evaporative Heating Surface/Cylinder Volume | 207.51 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 5076 |
| Same as above plus superheater percentage | 5076 |
| Same as above but substitute firebox area for grate area | 35,280 |
| Power L1 | 4762 |
| Power MT | 295.73 |