Data from "Messrs Vivian & Sons Works Locomotives, Swansea", Locomotive Magazine, Volume XXV [25] (15 September 1919), p. 143.
Long established in south Wales on the northern shoulder of the Bristol Channel, this copper smelting firm soon expanded to produce all manner of copper products. They were particularly well known for their copper firebox plates. "Copperopolis's" best known foundry at Hafod lay between the Swansea Canal on one side and a bend in the River Tawe on the other.
Over the years, Vivian & Sons built some of their own locomotives and bought some from other builders. In the 20th Century, Hafod's manager Captain Vivian noted the 1 in 23 (4.35%) grade from Hafod to the Great Western's junction, drafted specifications, and chose to purchase two saddle-tanks from Manning Wardle. Each could handle 70 ton trains up the ruling grade.
Fittingly, Vivian chose to supply the locomotive boilers' brass tubes and the fireboxes' plates. A notable feature was the use of dust covers on the entire valve motion from cylinders to crosshead.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 5 |
| Locobase ID | 20700 |
| Railroad | Vivian & Sons |
| Country | Great Britain |
| Whyte | 0-4-0ST |
| Number in Class | 2 |
| Road Numbers | 5-6 |
| Gauge | Std |
| Number Built | 2 |
| Builder | Hawthorn Leslie |
| Year | 1919 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 6 / 1.83 |
| Engine Wheelbase (ft / m) | 6 / 1.83 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | 6 / 1.83 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 61,600 / 27,941 |
| Engine Weight (lbs / kg) | 61,600 / 27,941 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 61,600 / 27,941 |
| Tender Water Capacity (gals / ML) | 900 / 3.41 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 0.60 / 1 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 51 / 25.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 40 / 1016 |
| Boiler Pressure (psi / kPa) | 165 / 1140 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 14" x 22" / 356x559 |
| Tractive Effort (lbs / kg) | 15,119 / 6857.87 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.07 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 49 / 4.55 |
| Grate Area (sq ft / m2) | 8.87 / 0.82 |
| Evaporative Heating Surface (sq ft / m2) | 590 / 54.81 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 590 / 54.81 |
| Evaporative Heating Surface/Cylinder Volume | 150.52 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1464 |
| Same as above plus superheater percentage | 1464 |
| Same as above but substitute firebox area for grate area | 8085 |
| Power L1 | 2343 |
| Power MT | 167.71 |