Data from 1913 QM & S locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.
By 1913, the QM & S had inherited this single Eight-wheeler from the QS, where it first appears in 1900. The boiler size, steam dome over the firebox, sharply coned boiler, and grate area, as well as general appearance, suggest the late 1880s. The diagram shows only the tube heating surface area. It specifically excludes the firebox and the both the builder and building date are both given as "Unknown".
Locobase's data comparison with other entries turns up a promising candidate, however. Entry 1148 shows the large O (later D8A) class built by the Pennsylvania Railroad at several plants (primarily the Altoona Machine Shop) in the early and mid-1880s. The tube count differs by one, but the tube length, grate area, cylinder volume, driver diameter, adhesion and engine weights, and wheelbases area virtually identical. Other PRR locomotives were sold to Canadian companies over the years when they could no longer handle the company's burgeoning traffic.
And a check of William D Edson's Pennsylvania roster (supplied to Locobase in August 1913 by Allen Stanley) shows that D8a road number 408, built at AMS (Altoona Machine Shop) in August 1886 (works number 1048) was sold to the Quebec & Southern in March 1901.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | G-3-A |
| Locobase ID | 6648 |
| Railroad | Quebec, Montreal & Southern |
| Country | Canada |
| Whyte | 4-4-0 |
| Number in Class | 1 |
| Road Numbers | 108 |
| Gauge | Std |
| Number Built | |
| Builder | Altoona |
| Year | 1886 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 8.50 / 2.59 |
| Engine Wheelbase (ft / m) | 23.50 / 7.16 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.36 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 59,600 / 27,034 |
| Engine Weight (lbs / kg) | 96,500 / 43,772 |
| Tender Loaded Weight (lbs / kg) | 60,000 / 27,216 |
| Total Engine and Tender Weight (lbs / kg) | 156,500 / 70,988 |
| Tender Water Capacity (gals / ML) | 3500 / 13.26 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 8 / 7 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 50 / 25 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 63 / 1600 |
| Boiler Pressure (psi / kPa) | 130 / 900 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 24" / 457x610 |
| Tractive Effort (lbs / kg) | 13,639 / 6186.55 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.37 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 192 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 11.04 / 3.36 |
| Firebox Area (sq ft / m2) | 142 / 13.19 |
| Grate Area (sq ft / m2) | 17.62 / 1.64 |
| Evaporative Heating Surface (sq ft / m2) | 1382 / 128.39 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1382 / 128.39 |
| Evaporative Heating Surface/Cylinder Volume | 195.47 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2291 |
| Same as above plus superheater percentage | 2291 |
| Same as above but substitute firebox area for grate area | 18,460 |
| Power L1 | 4039 |
| Power MT | 298.81 |