Barry 0-4-0 Locomotives in Great_Britain

Class Details by Steve Llanso of Sweat House Media

Class RM 1 (Locobase 20959)

Data from "Barry Railway," Locomotive Magazine, Volume XXIX [29] (15 June 1923), p. 171. See also H L Hopwood, "The Barry Railway: Its Characteristics, Engines and Traffic", Railway Magazine, Volume 42 (1918), pp. 215-227. Welsh Railways Research Circle, "Barry Railway (and related lines)" at [], last accessed 22 November 2021. Works numbers were 16466-16467 in 1905.

Joining the short-lived fad for rail motors, the Barry bought two rail motors for short-haul passenger service in the Vale of Glamorgan. Like most other such vehicles, the power unit drove the front bogie of a coach body whose total length over buffers reached 64 ft 10 in (19.76 m).

Its steam came from a vertical boiler that stood 9 ft (2.74 m) high in the carriage's head end. Over a round firebox rose a blossoming tube-bundle inside an inversely tapered boiler. Piston valves fed the cylinders immediately below the boiler.

According to the WRRC summary, service from Cardiff to Pontypridd began on 1 May 1905 and ended exactly one month later. RM's 1923 account states that the rail motors failed to develop the traffic adequately. Accordingly, the report concluded, "after a time service was reduced and in 1913 withdrawn altogether."

Principal Dimensions by Steve Llanso of Sweat House Media

ClassRM 1
Locobase ID20959
CountryGreat Britain
Number in Class2
Road NumbersRM 1-RM 2
Number Built2
BuilderNorth British
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)8 / 2.44
Engine Wheelbase (ft / m)8 / 2.44
Ratio of driving wheelbase to overall engine wheelbase1
Overall Wheelbase (engine & tender) (ft / m)40 / 12.19
Axle Loading (Maximum Weight per Axle) (lbs / kg) / 16,295
Weight on Drivers (lbs / kg) / 16,295
Engine Weight (lbs / kg) / 28,945
Tender Loaded Weight (lbs / kg) / 23,039
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)600 / 2.27
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 0.83 / 0.80
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)43.50 / 1105
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)12" x 16" / 305x406
Tractive Effort (lbs / kg)7203 / 3267.23
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)462 - 1.125" / 29
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 4.04 / 1.23
Firebox Area (sq ft / m2)45 / 4.18
Grate Area (sq ft / m2)11.50 / 1.07
Evaporative Heating Surface (sq ft / m2)597 / 55.46
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)597 / 55.46
Evaporative Heating Surface/Cylinder Volume285.05
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1840
Same as above plus superheater percentage1840
Same as above but substitute firebox area for grate area7200
Power L14553
Power MT

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