Padarn 0-6-0 Locomotives in Great_Britain

Class Details by Steve Llanso of Sweat House Media

Class Dinworic (Locobase 10484)

Data from "The Padarn Railway", The Locomotive Magazine, Volume XI [11] (16th January 1905), p. 13. Works numbers were 302, 410, and 631.

The Padarn connected the Dinorwic slate quarries at Llanberis in Wales with Port Dinworic 7 miles away. The quarries themselves were carved out of the mountain in terraces, each of which had its own narrow-gauge railway; they employed up to 3,000 men and boys.

The line locomotive stud included this trio from Hunslet: Dinorwic, Pandora (1886-(later Amalthaea), and Velinheli (1895), which had a tough alignment to work. The summit actually was in the middle of the line.

In 1909, Pandora was renamed Alamathea. The engines clearly suited their requirements as all three operated until scrapped in 1963. .

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID10484
CountryGreat Britain
Number in Class3
Road Numbers
Number Built3
BuilderHunslet Engine Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)10 / 3.05
Engine Wheelbase (ft / m)10 / 3.05
Ratio of driving wheelbase to overall engine wheelbase1
Overall Wheelbase (engine & tender) (ft / m)10 / 3.05
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)56,000 / 25,401
Engine Weight (lbs / kg)56,000 / 25,401
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)56,000 / 25,401
Tender Water Capacity (gals / ML)840 / 3.18
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)31 / 15.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42 / 1067
Boiler Pressure (psi / kPa)130 / 9
High Pressure Cylinders (dia x stroke) (in / mm)12.5" x 20" / 318x508
Tractive Effort (lbs / kg)8222 / 3729.44
Factor of Adhesion (Weight on Drivers/Tractive Effort) 6.81
Heating Ability
Tubes (number - dia) (in / mm)119 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 8.42 / 2.57
Firebox Area (sq ft / m2)49 / 4.55
Grate Area (sq ft / m2)8 / 0.74
Evaporative Heating Surface (sq ft / m2)507 / 47.10
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)507 / 47.10
Evaporative Heating Surface/Cylinder Volume178.48
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1040
Same as above plus superheater percentage1040
Same as above but substitute firebox area for grate area6370
Power L12409
Power MT284.51

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Wes Barris