Great Northern 0-6-4 Locomotives in Ireland

Class Details by Steve Llanso of Sweat House Media

Class RT (Locobase 8029)

Data from "Great Northern Railway", The Locomotive Magazine, Volume XVI, No 212 (15 April 1910) W T Scott's article in the Railway Preservation Society's 5-Foot 3 journal, January 1968, reproduced on the web at [] (accessed 23 December 2006). Works numbers were 5093-5094 in 1908 and 5531-5532 in 1911.

This quartet was essentially an 0-6-0T with a much larger than usual fuel bunker and water tanks. Scott describes some of the features of these dockside shunters:"In numbers 22 and 23 the leading and trailing horns were in two halves. All four engines had 1 1/4" play for the leading axle and a swivel bushing in the front half of the coupling rods. These features were of course intended for dock shunting. The cylinders were inclined at 1 in 8 and ordinary short travel slide valves were fitted. Spring links were non-adjustable on the driving axles but adjustable on the bogies."

Apparently never superheated, the class carried on until the early 1960s.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID8029
RailroadGreat Northern
Number in Class4
Road Numbers22-23, 166-167
Number Built4
BuilderBeyer, Peacock
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.50 / 4.11
Engine Wheelbase (ft / m)23.75
Ratio of driving wheelbase to overall engine wheelbase 0.57
Overall Wheelbase (engine & tender) (ft / m)23.75
Axle Loading (Maximum Weight per Axle) (lbs / kg)31,920 / 14,479
Weight on Drivers (lbs / kg)92,008
Engine Weight (lbs / kg)125,440 / 56,899
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)125,440 / 56,899
Tender Water Capacity (gals / ML)1620 / 6.14
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 3.30 / 3
Minimum weight of rail (calculated) (lb/yd / kg/m)51 / 25.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)51 / 1295
Boiler Pressure (psi / kPa)175 / 12.10
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x610
Tractive Effort (lbs / kg)20,230 / 9176.18
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.55
Heating Ability
Tubes (number - dia) (in / mm)212 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.45 / 3.19
Firebox Area (sq ft / m2)71.70 / 6.66
Grate Area (sq ft / m2)16.30 / 1.51
Evaporative Heating Surface (sq ft / m2)1087 / 100.98
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1087 / 100.98
Evaporative Heating Surface/Cylinder Volume172.40
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2853
Same as above plus superheater percentage2853
Same as above but substitute firebox area for grate area12,548
Power L13410
Power MT245.12

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