Data from "London & Lough Swilly Railway," The Locomotive, Volume 18, No (15 September 1912), p. 182. Works numbers were 985-986.
Later additions to the Lough Swilly, the extra driving axle providing useful traction and the total of eight axles spreading out the load. The locomotives had long Belpaire fireboxes that encompassed a sizable heating surface area.
Pride of the railway, these locomotives served first on the 49-mile (79 km) Letterkenny and Burtonport Railway extension as the heavy passenger haulers for much of their careers and helper service later. Both were scrapped in 1954.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 5 |
| Locobase ID | 2691 |
| Railroad | Londonderry & Lough Swilly |
| Country | Ireland |
| Whyte | 4-8-4T |
| Number in Class | 2 |
| Road Numbers | 5-6 |
| Gauge | 3' |
| Number Built | 2 |
| Builder | Hudswell, Clarke |
| Year | 1912 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 13.50 / 4.11 |
| Engine Wheelbase (ft / m) | 31 / 9.45 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.44 |
| Overall Wheelbase (engine & tender) (ft / m) | 31 / 9.45 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 76,160 / 34,546 |
| Engine Weight (lbs / kg) | 120,400 / 54,613 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 1800 / 6.82 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 2.80 / 3 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 32 / 16 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 45 / 1143 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 16" x 20" / 406x508 |
| Tractive Effort (lbs / kg) | 17,408 / 7896.15 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.38 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 146 / 13.56 |
| Grate Area (sq ft / m2) | 17.60 / 1.64 |
| Evaporative Heating Surface (sq ft / m2) | 1063 / 98.76 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1063 / 98.76 |
| Evaporative Heating Surface/Cylinder Volume | 228.40 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3168 |
| Same as above plus superheater percentage | 3168 |
| Same as above but substitute firebox area for grate area | 26,280 |
| Power L1 | 5201 |
| Power MT | 602.22 |