Data from "American Built Tank Engine, Port Talbot Ry & Docks Co," The Locomotive Magazine, Vol V (May 1900), p.76. See also "Cooke Locomotive for Wales," Railway and Locomotive Engineering, December 1899, page 523. Works numbers ran 2492-2493.
Following on the heels of some radial tanks that Cooke produced for the Barry Railway (10137), this substantially larger twosome went to the same part of the British Isles - South Wales. Applying greater adhesive weight to 4 axles rather than 3 kept the axle loading down while addressing the specifications in the original order.
According to Wikipedia's comment on this class, the specs called for pulling 800 tons up a 1.33% grade at 12 mph or 300 tons up a 2 1/2% grade at 8 mph. Although they didn't initially reach those goals, they were tweaked and answered the call. Savings in fuel and crew were quickly evident - one 0-8-2T could deputize for two 0-6-2Ts while burning 65 lb of coal per mile versus the double-headers' 94.
Declining to exercise an option on 3-5 more Cookes, Port Talbot instead plumped for even larger Sharp, Stewart locomotives in 1901.
In 1908, the pair, by now in the Great Western system, received the taper boilers then being turned out by Swindon.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 20 |
| Locobase ID | 10146 |
| Railroad | Port Talbot Railway & Docks |
| Country | Great Britain |
| Whyte | 0-8-2T |
| Number in Class | 2 |
| Road Numbers | 20-21 / 1378-1379 |
| Gauge | Std |
| Number Built | 2 |
| Builder | Cooke |
| Year | 1899 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 15.50 / 4.72 |
| Engine Wheelbase (ft / m) | 22.08 / 6.73 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.70 |
| Overall Wheelbase (engine & tender) (ft / m) | 22.08 / 6.73 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 136,640 / 61,979 |
| Engine Weight (lbs / kg) | 168,000 / 76,204 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 2400 / 9.09 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 2.20 / 2 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 57 / 28.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 52 / 1321 |
| Boiler Pressure (psi / kPa) | 175 / 1210 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 19" x 24" / 483x610 |
| Tractive Effort (lbs / kg) | 24,784 / 11241.85 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.51 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 219 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 11.92 / 3.63 |
| Firebox Area (sq ft / m2) | 128 / 11.90 |
| Grate Area (sq ft / m2) | 24.50 / 2.28 |
| Evaporative Heating Surface (sq ft / m2) | 1489 / 138.38 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1489 / 138.38 |
| Evaporative Heating Surface/Cylinder Volume | 189.06 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4288 |
| Same as above plus superheater percentage | 4288 |
| Same as above but substitute firebox area for grate area | 22,400 |
| Power L1 | 4100 |
| Power MT | 264.61 |