Rhymney 0-4-0 Locomotives in Great_Britain

Class Details by Steve Llanso of Sweat House Media

Class Steam Rail Motor-Car (Locobase 20034)

Data from "Steam Rail Motor-Car", Engineering, Volume XVII (1 November 1907), p. 600. Works numbers were 805-806.

The Rhymney had Hudswell, Clarke build a pair of rail motors. Unlike many rail motors, Rhymney's #1 was a full-fledged prime mover semi-permanently linked to a 64-passenger coach. C T Hurry Riches designed the combination and contracted with Messrs Cravens Ltd of Sheffield to build the coach. All seating was designed for third class and was divided between smoking and non-smoking sections.

The locomotive was rated to pull a six-wheel coach up a 1 in 35 (2.86%) grade. When they entered service in October, the Rhymney's general manager E A Prosser put one of the cars in service between Caerphilly and Senghenydd on a five-trains-a-weekday schedule.

In 1911, the 1 was converted to an independent, mixed-traffic tank locomotive that operated "chiefly between Rhymney Bridge, Ystrad Mynach, and Merthyr with four six-wheel coaches." At that time, the #2 still ran on the Senghenydd branch.

Principal Dimensions by Steve Llanso of Middle Run Media

ClassSteam Rail Motor-Car
Locobase ID20034
CountryGreat Britain
Number in Class2
Road Numbers1
Number Built2
BuilderHudswell, Clarke
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 8.50 / 2.59
Engine Wheelbase (ft / m) 8.50 / 2.59
Ratio of driving wheelbase to overall engine wheelbase1
Overall Wheelbase (engine & tender) (ft / m)55.83 / 17.02
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)840 / 3.18
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)42 / 1067
Boiler Pressure (psi / kPa)175 / 12.10
High Pressure Cylinders (dia x stroke) (in / mm)12" x 16" / 305x406
Tractive Effort (lbs / kg)8160 / 3701.32
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)210 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 6.08 / 1.85
Firebox Area (sq ft / m2)71.70 / 6.66
Grate Area (sq ft / m2)14.51 / 1.35
Evaporative Heating Surface (sq ft / m2)661 / 61.41
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)661 / 61.41
Evaporative Heating Surface/Cylinder Volume315.60
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2539
Same as above plus superheater percentage2539
Same as above but substitute firebox area for grate area12,548
Power L15963
Power MT

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