Belfast & County Down 2-4-2 Locomotives in Ireland

Class Details by Steve Llanso of Sweat House Media

Class 5 (Locobase 10380)

Data from "Recent Belfast & County Down Ry Locomotives," The Locomotive Magazine, Vol IX (26 September 1903), p. 187. Works numbers were 3853-3854, 3868-3869, 3882-3883.

Often described as "4-coupled double-radial tanks", these bi-directionals were dedicated primarily to supporting the heavy local traffic northeast down the Belfast Lough to Holywood and on to Bangor. Compared to other double-radial tanks in the British Isles, these were about average to a wee bit small.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID10380
RailroadBelfast & County Down
Number in Class6
Road Numbers5, 7-8, 27-29
Number Built6
BuilderBeyer, Peacock
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)7 / 2.13
Engine Wheelbase (ft / m)20.67 / 6.30
Ratio of driving wheelbase to overall engine wheelbase 0.34
Overall Wheelbase (engine & tender) (ft / m)20.67 / 6.30
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)110,880 / 50,294
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)110,880 / 50,294
Tender Water Capacity (gals / ML)1320 / 5
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)66 / 1676
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)16" x 24" / 406x610
Tractive Effort (lbs / kg)12,660 / 5742.49
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)87 / 8.09
Grate Area (sq ft / m2)14.80 / 1.38
Evaporative Heating Surface (sq ft / m2)971 / 90.24
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)971 / 90.24
Evaporative Heating Surface/Cylinder Volume173.86
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2368
Same as above plus superheater percentage2368
Same as above but substitute firebox area for grate area13,920
Power L14431
Power MT

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