Data from "The Locomotive 'James Spooner'", Engineering, Volume 15 (3 March 1873), pp. 179-181. See also Festpedia, hosted by the FR Heritage Group, at [] (last accessed 25 August 2013). (Thanks to Alexander Blessing for his 10 September 2019 email correcting the valve gear ID.) Avonside works numbers 929-930 in 1972.
The Locomotive Magazine of September 1900 details this early double Fairlie, which had two boilers and engine bogies under a frame with two fireboxes back to back that fed both boilers. See also "The Festiniog Railway", reprinted from Engineering, 24 September 1869 in C E Spooner, Narrow Gauge Railways, 2d Edition (London: E & F N Spon, 1879), pp. 18-24. (Thanks to Alexander Blessing for his 10 September 2019 email correcting the valve gear ID.)
The LM article notes the locomotive's surprising power as it hauled 110-120 tons up the grade to the quarries of this Welsh narrow gauge. She also took the sharp curves at up to 35 mph, thus vindicating the design. Surprisingly, perhaps, The Locomotive Magazine doesn't tell the reader that the track was too roughly laid and the Little Wonder wore herself out by 1882. A near-duplicate -- James Spooner -- was delivered from Avonside in 1872; see Locobase 15376.
Data from [], accessed 4 January 2007; and "The Festiniog [sic] and its Locomotives", Locomotive Magazine, Volume XXVI [26] (15 July 1920), pp.152-154.. (Thanks to Alexander Blessing for his 10 September 2019 email correcting the valve gear ID.)
Principal Dimensions by Steve Llanso of Sweat House Media | |||
---|---|---|---|
Class | James Spooner | Little Wonder | Merddyn Emrys |
Locobase ID | 15376 | 5978 | 8059 |
Railroad | Ffestiniog | Ffestiniog | Ffestiniog |
Country | Great Britain | Great Britain | Great Britain |
Whyte | 0-4-4-0T | 0-4-4-0T | 0-4-4-0T |
Number in Class | 1 | 1 | 1 |
Road Numbers | 8 | 7 | |
Gauge | 60 cm | 60 cm | 60 cm |
Number Built | 1 | 1 | 1 |
Builder | Avonside | Fairlie Engine & Steam Carriage Co | Ffestiniog |
Year | 1872 | 1869 | 1879 |
Valve Gear | Stephenson | Gooch | Stephenson |
Locomotive Length and Weight | |||
Driver Wheelbase (ft / m) | 9 / 1.40 | 10 / 0.90 | 9.33 / 2.84 |
Engine Wheelbase (ft / m) | 18.67 / 5.69 | 19.08 / 2.30 | 20 / 6.10 |
Ratio of driving wheelbase to overall engine wheelbase | 0.48 | 0.52 | 0.47 |
Overall Wheelbase (engine & tender) (ft / m) | 18.67 / 5.69 | 19.08 | 20 / 6.10 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |||
Weight on Drivers (lbs / kg) | 44,912 / 20,372 | 43,680 / 19,813 | 44,992 / 20,321 |
Engine Weight (lbs / kg) | 44,912 / 20,372 | 43,680 / 19,813 | 44,800 / 20,321 |
Tender Loaded Weight (lbs / kg) | |||
Total Engine and Tender Weight (lbs / kg) | 44,912 / 20,372 | 43,680 / 19,813 | 44,800 / 20,321 |
Tender Water Capacity (gals / ML) | 720 / 2.73 | 400 / 1.52 | |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 0.40 | 0.40 | |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 19 / 9.50 | 18 / 9 | 19 / 9.50 |
Geometry Relating to Tractive Effort | |||
Driver Diameter (in / mm) | 32 / 711 | 28 / 711 | 32 / 813 |
Boiler Pressure (psi / kPa) | 140 / 11 | 160 / 11 | 160 / 11 |
High Pressure Cylinders (dia x stroke) (in / mm) | 8.5" x 14" / 216x356 (4) | 8.25" x 13" / 210x330 (4) | 9" x 14" / 229x356 (4) |
Tractive Effort (lbs / kg) | 7523 / 3412.38 | 8595 / 3898.63 | 9639 / 4372.18 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.97 | 5.08 | 4.67 |
Heating Ability | |||
Tubes (number - dia) (in / mm) | 204 - 1.5" / 38 | 218 - 1.25" / 32 | 248 - 1.5" / 38 |
Flues (number - dia) (in / mm) | |||
Flue/Tube length (ft / m) | 7.87 / 2.40 | 7.83 / 2.39 | 8.40 / 2.56 |
Firebox Area (sq ft / m2) | 84 / 7.80 | 60 / 5.57 | 69.10 / 6.42 |
Grate Area (sq ft / m2) | 11.20 / 1.04 | 11 / 1.02 | 12.40 / 1.15 |
Evaporative Heating Surface (sq ft / m2) | 713 / 66.24 | 730 / 67.82 | 887 / 82.41 |
Superheating Surface (sq ft / m2) | |||
Combined Heating Surface (sq ft / m2) | 713 / 66.24 | 730 / 67.82 | 887 / 82.41 |
Evaporative Heating Surface/Cylinder Volume | 387.72 | 453.80 | 430.23 |
Computations Relating to Power Output (More Information) | |||
Robert LeMassena's Power Computation | 1568 | 1760 | 1984 |
Same as above plus superheater percentage | 1568 | 1760 | 1984 |
Same as above but substitute firebox area for grate area | 11,760 | 9600 | 11,056 |
Power L1 | 4600 | 4781 | 5101 |
Power MT | 903.21 | 965.23 | 999.80 |