Rhymney 2-4-0 Locomotives in Great_Britain

Class Details by Steve Llanso of Sweat House Media

Class 7 (Locobase 20456)

Data from "The Rhymney Ry. And Its Engines," Locomotive Magazine, Volume XXI [21] (15 November 1915), pp. 201-202; and the Vulcan Foundry drawing archived at [], last accessed 29 October 2018. Works numbers were 419-421 in 1857.

These were the first passenger locomotives to enter service with the Rhymney Railway, being the next three engines completed by Vulcan after the first six goods locomotives described in Locobase 20455. Its passenger orientation is apparent in the 8" (203 mm) taller drivers. Trailing load consisted of stubby four-wheel carriages produced by Williams of Goswell Road in London and included both passenger accommodation and Royal Mail vans.

In 1880-1881, the 7-9 were converted to saddle-tank 2-4-0s. In that configuration, the class continued in service until 1894.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID20456
CountryGreat Britain
Number in Class3
Road Numbers7-9
Number Built3
BuilderVulcan Foundry
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 8.08 / 2.46
Engine Wheelbase (ft / m)14.50 / 4.42
Ratio of driving wheelbase to overall engine wheelbase 0.56
Overall Wheelbase (engine & tender) (ft / m)32.71 / 9.97
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)1200 / 4.55
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)63 / 1600
Boiler Pressure (psi / kPa)140 / 9.70
High Pressure Cylinders (dia x stroke) (in / mm)16" x 20" / 406x508
Tractive Effort (lbs / kg)9671 / 4386.70
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)173 - 1.875" / 48
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.29 / 3.14
Firebox Area (sq ft / m2)75.50 / 7.01
Grate Area (sq ft / m2)14.60 / 1.36
Evaporative Heating Surface (sq ft / m2)948 / 88.07
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)948 / 88.07
Evaporative Heating Surface/Cylinder Volume203.69
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2044
Same as above plus superheater percentage2044
Same as above but substitute firebox area for grate area10,570
Power L14186
Power MT

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