Data from "Narrow Gauge Locomotive, C & L Ry USA," The Locomotive Magazine, Vol V (March 1900), p.46. See also DeGolyer, Vol 15, p. 240.
Although the article has a photograph that clearly shows the Cornwall & Lebanon name on the tender and the 15 on tender and cab, Connelly's Baldwin records do not list a Cornwall & Lebanon - at first. Digging into Google, Locobase finds that a portion of the description in the LM article is incorrect - this locomotive was produced not in 1898, but in 1890 (works number 10946). There, however, Connelly's entry credits the engine with 10" x 16" cylinders. Two others - 11-12 (works numbers 10056 and 10100) had 10" x 14" cylinders; they were produced in July 1889 with 11's construction taking only 8 days.
In any case, the LM write-up describes an railroad profile with a maximum grade of 4.5% and 120-ft radius curves on which the doughty 15 could take 25 ton loads. When Locobase puzzled over such a small load, he discovered a Catskill Archive article -- [], last accessed 14 April 2009 -- which noted that the MG - a 4-mile road between Reading and Harrisburg, PA -- was the only 2-ft gauge railroad in the US to use 4-4-0s. Its tracks wound away from a station on the Cornwall & Lebanon, along the shore of Lake Conewago and scaled the 1,120-ft peak of Governor Dick hill.
After it closed as a tourist line, the MG operated a short haul to the Rifle Range for the National Guard until 1916 when an accident involving an overcrowded car injured several guardsmen.
NB: The direct heating surface (including the firebox heating surface) is an estimate calculated by subtracting the calculated tube heating surface from the reported total evaporative heating surface.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 15 |
| Locobase ID | 10141 |
| Railroad | Mount Gretna |
| Country | USA |
| Whyte | 4-4-0 |
| Number in Class | 1 |
| Road Numbers | 15 |
| Gauge | 2' |
| Number Built | 1 |
| Builder | Burnham, Williams & Co |
| Year | 1890 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 5 / 1.52 |
| Engine Wheelbase (ft / m) | 14.50 / 4.42 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.34 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 21,280 / 9652 |
| Engine Weight (lbs / kg) | 31,360 / 14,225 |
| Tender Loaded Weight (lbs / kg) | 24,640 / 11,177 |
| Total Engine and Tender Weight (lbs / kg) | 56,000 / 25,402 |
| Tender Water Capacity (gals / ML) | 1440 / 5.45 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 18 / 9 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 33 / 838 |
| Boiler Pressure (psi / kPa) | 150 / 1030 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 10" x 14" / 254x356 |
| Tractive Effort (lbs / kg) | 5409 / 2453.48 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.93 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 101 - 1.5" / 38 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 8 / 2.44 |
| Firebox Area (sq ft / m2) | 42 / 3.90 |
| Grate Area (sq ft / m2) | 5.95 / 0.55 |
| Evaporative Heating Surface (sq ft / m2) | 357 / 33.18 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 357 / 33.18 |
| Evaporative Heating Surface/Cylinder Volume | 281.10 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 893 |
| Same as above plus superheater percentage | 893 |
| Same as above but substitute firebox area for grate area | 6300 |
| Power L1 | 3683 |
| Power MT | 763.12 |