Data from "The Padarn Railway", The Locomotive Magazine, Volume XI [11] (16 January 1905), p. 13. Works numbers 638 and 671.
As noted in 10484, the Padarn Railway served an enormous quarry complex that was broken into terraces. These were served by the little four-coupled Mills-class engines (the other named Port Dinorwic [sic]) supplied by Hunslet, which pulled the loaded carts to the main line.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Vaenol |
| Locobase ID | 10485 |
| Railroad | Mills Tramway |
| Country | Great Britain |
| Whyte | 0-4-0ST |
| Number in Class | 2 |
| Road Numbers | |
| Gauge | 22 3/4" |
| Number Built | 2 |
| Builder | Hunslet Engine Co |
| Year | 1895 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 4.50 / 1.37 |
| Engine Wheelbase (ft / m) | 4.50 / 1.37 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | 4.50 / 1.37 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 26,320 / 11,939 |
| Engine Weight (lbs / kg) | 26,320 / 11,939 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 26,320 / 11,939 |
| Tender Water Capacity (gals / ML) | 264 / 1 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 0.20 / 0.20 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 22 / 11 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 26 / 660 |
| Boiler Pressure (psi / kPa) | 140 / 970 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 8.5" x 14" / 216x356 |
| Tractive Effort (lbs / kg) | 4630 / 2100.14 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.68 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 45 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 22 / 2.04 |
| Grate Area (sq ft / m2) | 3.50 / 0.33 |
| Evaporative Heating Surface (sq ft / m2) | 193 / 17.93 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 193 / 17.93 |
| Evaporative Heating Surface/Cylinder Volume | 209.90 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 490 |
| Same as above plus superheater percentage | 490 |
| Same as above but substitute firebox area for grate area | 3080 |
| Power L1 | 1999 |
| Power MT | 334.88 |