Londonderry & Lough Swilly 4-8-0 Locomotives in Ireland

Class Details by Steve Llanso of Sweat House Media

Class 11 (Locobase 2695)

Data from "Heavy Locomotives for the Londonderry and Lough Swilly Ry," Locomotive Magazine, Volume XVIII (15 October 1912), p. 207. See also R M Livesey, "Rolling-Stock on the Principal Irish Narrow-Gauge Railways", Engineering, Volume 94, (2 August 1912), pp. 169-176, table on p. 175. Works numbers were 746-747 in 1905.

A rarity on the the L&LS, this tender-engine set of Twelve-Wheelers provided the brawn for the line, Locomotive superintendent Ingham Sutcliffe bought the two engines to handle the increase of traffic seen on the line in recent years. These were "built specially" to work the 74 3/4 miles between Londonderry and Burtonport over a line that had one four-mile stretch that climbed at 2%.

They had wide Belpaire fireboxes and were the only Irish narrow-gauge trailing a separate tender.

Retirements came in 1933 (#11) and 1954 (#12).

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID2695
RailroadLondonderry & Lough Swilly
Number in Class2
Road Numbers11-12
Number Built2
BuilderHudswell, Clarke
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.50 / 4.11
Engine Wheelbase (ft / m)21.62 / 6.59
Ratio of driving wheelbase to overall engine wheelbase 0.62
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)15,680 / 7112
Weight on Drivers (lbs / kg)59,136 / 26,824
Engine Weight (lbs / kg)129,920 / 58,931
Tender Loaded Weight (lbs / kg)47,488 / 21,540
Total Engine and Tender Weight (lbs / kg)177,408 / 80,471
Tender Water Capacity (gals / ML)1800 / 6.82
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 4.40 / 4
Minimum weight of rail (calculated) (lb/yd / kg/m)25 / 12.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)45 / 1143
Boiler Pressure (psi / kPa)170 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)15.5" x 22" / 394x559
Tractive Effort (lbs / kg)16,972 / 7698.38
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.48
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)115.90 / 10.77
Grate Area (sq ft / m2)15 / 1.39
Evaporative Heating Surface (sq ft / m2)1005 / 93.37
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1005 / 93.37
Evaporative Heating Surface/Cylinder Volume209.17
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2550
Same as above plus superheater percentage2550
Same as above but substitute firebox area for grate area19,703
Power L14205
Power MT627.06

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