Data from "The Padarn Railway", The Locomotive Magazine, Volume XI (15 February 1905), p. 23.
This tender locomotive was built not too long after the railway turned to steam power by a little-known builder based at the Northfleet Iron Works in Kent. The unusually long wheelbase wasn't likely to be repeated for several reasons, two of which would be the difficulties presented rounding curves and the stress on the coupling rods; these broke repeatedly as a result. Also, the locomotive had no frame; cylinders were mounted high on the boiler as were the axle mountings. It burned coke hauled in a big-wheeled tender of 1840s vintage.
Yet the verdict on the pair is surprisingly positive: "[W]e understand with the exception of the troubles ...with bent coupling rods and shifting eccentrics, the engines did their work very well." Fire Queen was preserved after almost 40 years of service while Jenny Lind was scrapped in 1884.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Fire Queen |
| Locobase ID | 10487 |
| Railroad | Padarn |
| Country | Great Britain |
| Whyte | 0-4-0 |
| Number in Class | 2 |
| Road Numbers | |
| Gauge | 4' |
| Number Built | 2 |
| Builder | A Horlock & Co |
| Year | 1848 |
| Valve Gear | Link |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12.04 / 3.67 |
| Engine Wheelbase (ft / m) | 12.04 / 3.67 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | 25.87 / 7.89 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | |
| Engine Weight (lbs / kg) | |
| 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) | |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 54 / 1372 |
| Boiler Pressure (psi / kPa) | 60 / 410 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 13" x 22" / 330x559 |
| Tractive Effort (lbs / kg) | 3511 / 1592.56 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 86 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 50.50 / 4.69 |
| Grate Area (sq ft / m2) | 9.75 / 0.91 |
| Evaporative Heating Surface (sq ft / m2) | 437 / 40.61 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 437 / 40.61 |
| Evaporative Heating Surface/Cylinder Volume | 129.30 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 585 |
| Same as above plus superheater percentage | 585 |
| Same as above but substitute firebox area for grate area | 3030 |
| Power L1 | 1102 |
| Power MT | |