Data from Soo 3 - 1909 Classification of Locomotives and Soo 9 - 1943 Steam Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Stanley later added Soo 3-1909 Classification of Locomotives in August 2013. (Thanks to Chris Hohl for his 20 April 2020 email correcting the original WSSM&A road number, engine wheelbase, and engine weight.) Rhode Island works number was 1876.
Although clearly meant to be a switcher (and thus excluded from Locobase 3.0), this engine merited inclusion nevertheless because it was based on Matthias Forney's tank locomotive design. The permanent junction of tender and locomotive allowed for a large and generously endowed firebox.
A later boiler had ten fewer tubes, which reduced evaporative heating surface area to 925 sq ft (85.94 sq m). Delivered as a Forney, the Y's bunker and tank were later exchanged for a separate tender, creating an 0-4-0 which merited a change in class to A.
Rhode Island completed a very similar engine in the same year for the Boston & Providence; it had four more boiler tubes and a evaporative heating surface area of approximately 950 sq ft.(88.26 sq m).
Principal Dimensions by Steve Llanso of Middle Run Media | |
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Class | Y/A |
Locobase ID | 11406 |
Railroad | Minneapolis, Sault Ste Marie & Atlantic (Soo) |
Country | USA |
Whyte | 0-4-6T |
Number in Class | 1 |
Road Numbers | 37/320 |
Gauge | Std |
Number Built | 1 |
Builder | Rhode Island |
Year | 1887 |
Valve Gear | Stephenson |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 6.50 / 1.98 |
Engine Wheelbase (ft / m) | 25.58 / 8.28 |
Ratio of driving wheelbase to overall engine wheelbase | 0.25 |
Overall Wheelbase (engine & tender) (ft / m) | 25.58 / 8.28 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | 69,190 / 31,384 |
Engine Weight (lbs / kg) | 118,500 / 31,384 |
Tender Loaded Weight (lbs / kg) | |
Total Engine and Tender Weight (lbs / kg) | |
Tender Water Capacity (gals / ML) | 1900 / 7.20 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 4 / 4 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 58 / 29 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 57 / 1448 |
Boiler Pressure (psi / kPa) | 160 / 1100 |
High Pressure Cylinders (dia x stroke) (in / mm) | 17" x 20" / 432x508 |
Tractive Effort (lbs / kg) | 13,791 / 6255.50 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.02 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 162 - 2" / 51 |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | 10.67 / 3.25 |
Firebox Area (sq ft / m2) | 85.32 / 7.93 |
Grate Area (sq ft / m2) | 17.73 / 1.65 |
Evaporative Heating Surface (sq ft / m2) | 990 / 91.97 |
Superheating Surface (sq ft / m2) | |
Combined Heating Surface (sq ft / m2) | 990 / 91.97 |
Evaporative Heating Surface/Cylinder Volume | 188.57 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 2837 |
Same as above plus superheater percentage | 2837 |
Same as above but substitute firebox area for grate area | 13,651 |
Power L1 | 4101 |
Power MT | 261.34 |