Northern Counties Committee 2-4-4 Locomotives in Ireland

Class Details by Steve Llanso of Sweat House Media

Class S2 (Locobase 9546)

[] (last accessed 1 September 2008).

Locobase 2688 describes the original 2-4-2T Worsdell/Von Borries cross-compound S class as it went into service on the Ballymena & Northern Counties in 1892. It's not clear why the railway chose to modify one of the six, but an expiring boiler may have prompted the decision. A G6S boiler normally used on a standard-gauge frame ws fitted, which promoted a significant reworking of the frame and the addition of a rear coal bunker.

Alas, the conversion was a flop. The new running gear layout induced derailments and the locomotive drivers slipped frequently because of the low percentage of total engine weight devoted to adhesion. After amassing only 3,000 miles in 1934, 110 was essentially retired except for brief intervals during World War II.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID9546
RailroadNorthern Counties Committee (NCC)
Number in Class1
Road Numbers110
Number Built
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)24.75 / 7.54
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)25,536 / 11,583
Engine Weight (lbs / kg)91,952 / 41,709
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)91,952 / 41,709
Tender Water Capacity (gals / ML)684 / 2.59
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 1.70 / 2
Minimum weight of rail (calculated) (lb/yd / kg/m)21 / 10.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)45 / 1143
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)14.75" x 20" / 375x508 (1)
Low Pressure Cylinders (dia x stroke) (in / mm)21" x 20" / 533x508 (1)
Tractive Effort (lbs / kg)11,008 / 4993.15
Factor of Adhesion (Weight on Drivers/Tractive Effort) 2.32
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)83 / 7.71
Grate Area (sq ft / m2)
Evaporative Heating Surface (sq ft / m2)825 / 76.67
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)825 / 76.67
Evaporative Heating Surface/Cylinder Volume417.15
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation
Same as above plus superheater percentage
Same as above but substitute firebox area for grate area16,600
Power L14640
Power MT801.18

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