Port Talbot Railway & Docks 0-8-2 Locomotives in Great_Britain

Class Details by Steve Llanso of Sweat House Media

Class 20 (Locobase 10146)

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

Locobase ID10146
RailroadPort Talbot Railway & Docks
CountryGreat Britain
Number in Class2
Road Numbers20-21 / 1378-1379
Number Built2
Valve GearStephenson
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)168,000 / 76,204
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 / 12.10
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 Volume189.06
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4288
Same as above plus superheater percentage4288
Same as above but substitute firebox area for grate area22,400
Power L14100
Power MT264.61

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