Londonderry & Lough Swilly 4-6-2 Locomotives in Ireland


Class Details by Steve Llanso of Sweat House Media

Class 13 (Locobase 2693)

Data from R M Livesey, "Rolling-Stock on the Principal Irish Narrow-Gauge Railways", Engineering, Volume 94, (2 August 1912), pp. 169-176, table on p. Works numbers were 2801-2802 in 1909.

The heavyweight Pacific tanks on the L&LS, whose narrow gauge led to outside frames. Their boilers were heated with Belpaire fireboxes.

These two were scrapped during World War II, 13 in 1940, 14 in 1943.


Class Aberfoyle (Locobase 2692)

Lighter Pacific tanks than the six that came to the L&LS from Hudswell, Clarke. The two engines -- the other's name was Richmond -- had markedly different fates. Aberfoyle was scrapped in 1928, while Richmond lasted until all steam was scrapped in 1954.


Class King Edward VII (Locobase 2690)

Data from "Londonderry and Lough Swilly Ry and Its Connections," The Locomotive Magazine, Vol IX (4 July 1902), p. 8.

The L&LS eventually included 99.5 miles from Londonderry through Lough Swilly (8 1/2 miles distant), Letterkenny, and Burtonport.

These sturdy engines had been intended for the northern branch to Cardonagh, but ran on all of the L&LS until they were scrapped. 7 and 8 adopted the Allan straight-link valve motion in preference to the Stephenson gear used on 5 and 6.

King Edward VII rode behind #7, hence its adoption of that name. This engine was scrapped in 1940; the others lasted until 1953-1954.

Principal Dimensions by Steve Llanso of Middle Run Media
Class13AberfoyleKing Edward VII
Locobase ID2693 2692 2690
RailroadLondonderry & Lough SwillyLondonderry & Lough SwillyLondonderry & Lough Swilly
CountryIrelandIrelandIreland
Whyte4-6-2T4-6-2T4-6-2T
Number in Class224
Road Numbers13-149-105-8
Gauge3'3'3'
Number Built224
BuilderHawthorn LeslieKerr, Stuart & CoHudswell, Clarke
Year191019021899
Valve GearWalschaertvarious
Locomotive Length and Weight
Driver Wheelbase (ft / m)9 / 2.749 / 2.74
Engine Wheelbase (ft / m)23.42 / 7.1422.50 / 6.86
Ratio of driving wheelbase to overall engine wheelbase 0.38 0.40
Overall Wheelbase (engine & tender) (ft / m)23.42 / 7.1422.50 / 6.86
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)56,000 / 25,401
Engine Weight (lbs / kg)93,072 / 42,21778,400 / 35,56291,840 / 41,658
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)93,072 / 42,21778,400 / 35,56291,840 / 41,658
Tender Water Capacity (gals / ML)2160 / 8.181080 / 4.09
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 1.93 / 2 1.70 / 2
Minimum weight of rail (calculated) (lb/yd / kg/m)31 / 15.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)45 / 114342 / 106745 / 1143
Boiler Pressure (psi / kPa)175 / 1210150 / 1030150 / 1030
High Pressure Cylinders (dia x stroke) (in / mm)14.5" x 22" / 368x55914" x 20" / 356x50815" x 22" / 381x559
Tractive Effort (lbs / kg)15,290 / 6935.4411,900 / 5397.7614,025 / 6361.64
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.66
Heating Ability
Tubes (number - dia) (in / mm)150 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)75 / 6.9782.30 / 7.65
Grate Area (sq ft / m2)11.50 / 1.0713 / 1.21
Evaporative Heating Surface (sq ft / m2)903 / 83.89832 / 77.32
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)903 / 83.89832 / 77.32
Evaporative Heating Surface/Cylinder Volume214.76184.90
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation20131950
Same as above plus superheater percentage20131950
Same as above but substitute firebox area for grate area13,12512,345
Power L139893109
Power MT471.12

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