Data from table entitle"Motive Power Boston & Providence Railroad Company-November 1856" in Railway and Locomotive Engineering, Volume 12, No 10 (October 1899), page 443, prepared by George S Griggs, then Superintendent of Motive Power at the B&P's Roxbury, Mass Machine Shop. See also 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.
This may have been a switcher as it one of a few using the all-coupled wheel arrangement then popular in Europe for freight engines. Its smaller boiler and grate suggest a short-range aspiration. It was delivered in June 1850.
In the October 1851 trials, the two all-adhesion freight engines (the other being Milo, Locobase 13552) ran a different route that measured only 1.7 miles in length. They each hauled a 650-ton train consisting of 114 loaded cars.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Highlander |
| Locobase ID | 9536 |
| Railroad | Boston & Providence |
| Country | USA |
| Whyte | 0-6-0 |
| Number in Class | 1 |
| Road Numbers | 7 |
| Gauge | Std |
| Number Built | 1 |
| Builder | B&P Roxbury |
| Year | 1850 |
| Valve Gear | drop-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) | 41,200 / 18,688 |
| Engine Weight (lbs / kg) | 41,200 / 18,688 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 1430 / 5.42 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1.50 / 1 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 23 / 11.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 48 / 1219 |
| Boiler Pressure (psi / kPa) | 120 / 520 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 14.75" x 18" / 375x457 |
| Tractive Effort (lbs / kg) | 8322 / 3774.80 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.95 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 142 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 9.33 / 2.84 |
| Firebox Area (sq ft / m2) | 51.80 / 4.81 |
| Grate Area (sq ft / m2) | 8.90 / 0.83 |
| Evaporative Heating Surface (sq ft / m2) | 659 / 61.25 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 659 / 61.25 |
| Evaporative Heating Surface/Cylinder Volume | 185.11 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1068 |
| Same as above plus superheater percentage | 1068 |
| Same as above but substitute firebox area for grate area | 6216 |
| Power L1 | 2476 |
| Power MT | 397.47 |