Londonderry & Lough Swilly 0-6-2 Locomotives in Ireland

Class Details by Steve Llanso of Sweat House Media

Class JT Macky (Locobase 2698)

Data from "Londonderry and Lough Swilly Ry and Its Connections," The Locomotive Magazine, Vol IX (4 July 1902), p. 9.

Works numbers were 694 in 1882 and 742-743 in 1883. .

The first new engines on the L&LS, this group of freight tanks operated until their scrapping in 1911-1913. Engine #2 was named Londonderry, and #3 was called Donegal.

The author reported on the "peculiar features" -- its "long, low-pitched boiler and short coupled wheel base; the tanks are carried underneath the bunker.".

Principal Dimensions by Steve Llanso of Sweat House Media

ClassJT Macky
Locobase ID2698
RailroadLondonderry & Lough Swilly
Number in Class3
Road Numbers1-3
Number Built3
BuilderBlack, Hawthorn
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.25
Engine Wheelbase (ft / m)16.50
Ratio of driving wheelbase to overall engine wheelbase 0.56
Overall Wheelbase (engine & tender) (ft / m)16.50
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)53,760 / 24,385
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)53,760 / 24,385
Tender Water Capacity (gals / ML)600
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 1.40
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42 / 1067
Boiler Pressure (psi / kPa)140 / 9.70
High Pressure Cylinders (dia x stroke) (in / mm)13" x 19" / 330x483
Tractive Effort (lbs / kg)9098 / 4126.79
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)
Grate Area (sq ft / m2)
Evaporative Heating Surface (sq ft / m2)
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)
Evaporative Heating Surface/Cylinder Volume
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 area
Power L1
Power MT

All material Copyright ©
Wes Barris