Data from "Early Locomotive Works," Railroad Age Gazette, Volume XLV, No 16 (11 September 1908), p. 914. See also [], last accessed 3 December 2011 and D K Minor (ed), "Boston And Lowell Railroad," American Railroad Journal and Advocate of Internal Improvements, Volume III, No 30 (2 August 1834), p. 469.
Data from table entitled "Table of Dimensions of the Locomotives" in New England Association of Railway Superintendents, Report of the Trials of Locomotive Engines Made Upon 1st and 2nd October, 1851 (Boston: B J Yerrinton, Printers, 1852), p. 16.
The St Clair was designed by the Essex's superintendent Caleb W Marvel. Locobase suspects that the Huron (later #21 of the O & LC) was a sister engine. The O & LC would eventually merge with the Rutland. NB: Boiler pressure and tube length both represent estimates.
Principal Dimensions by Steve Llanso of Sweat House Media | ||
---|---|---|
Class | Double Speeder | Essex |
Locobase ID | 13513 | 13550 |
Railroad | Boston & Lowell | Boston & Lowell |
Country | USA | USA |
Whyte | 4-2-0 | 4-2-0 |
Number in Class | 1 | 1 |
Road Numbers | ||
Gauge | Std | Std |
Number Built | 1 | 1 |
Builder | Lowell Machine Shop | Essex Company |
Year | 1835 | 1851 |
Valve Gear | Stephenson | V-hook |
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | ||
Engine Wheelbase (ft / m) | ||
Ratio of driving wheelbase to overall engine wheelbase | ||
Overall Wheelbase (engine & tender) (ft / m) | ||
Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
Weight on Drivers (lbs / kg) | 14,500 / 6577 | |
Engine Weight (lbs / kg) | 23,000 / 10,433 | 48,740 / 22,108 |
Tender Loaded Weight (lbs / kg) | ||
Total Engine and Tender Weight (lbs / kg) | ||
Tender Water Capacity (gals / ML) | ||
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | ||
Minimum weight of rail (calculated) (lb/yd / kg/m) | 24 / 12 | |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 60 / 1524 | 72 / 1829 |
Boiler Pressure (psi / kPa) | 90 / 6.20 | 100 / 6.90 |
High Pressure Cylinders (dia x stroke) (in / mm) | 11" x 16" / 279x406 | 15" x 20" / 381x508 |
Tractive Effort (lbs / kg) | 2468 / 1119.47 | 5313 / 2409.94 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.88 | |
Heating Ability | ||
Tubes (number - dia) (in / mm) | 139 - 1.75" / 44 | |
Flues (number - dia) (in / mm) | ||
Flue/Tube length (ft / m) | 9.92 / 3.02 | |
Firebox Area (sq ft / m2) | 61.31 / 5.70 | |
Grate Area (sq ft / m2) | 6.40 / 0.59 | 10.75 / 1 |
Evaporative Heating Surface (sq ft / m2) | 300 / 27.87 | 692 / 64.29 |
Superheating Surface (sq ft / m2) | ||
Combined Heating Surface (sq ft / m2) | 300 / 27.87 | 692 / 64.29 |
Evaporative Heating Surface/Cylinder Volume | 170.45 | 169.19 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 576 | 1075 |
Same as above plus superheater percentage | 576 | 1075 |
Same as above but substitute firebox area for grate area | 6131 | |
Power L1 | 2930 | |
Power MT |