Midland Great Western 4-4-0 Locomotives in Ireland

Class Details by Steve Llanso of Sweat House Media

Class A (Locobase 2686)

Data from Railway Engineer, February 1905, p. 39.

Designed by E Cusack to pull 310 tons at 60 mph on the flat, 280 tons up 1% at 30 mph. It served the heavy mail and passenger trains between Dublin and Broadstone. Belpaire boiler with inside everything except the connecting rods and painted a very attractive dark blue.

At the time of service entry, the Celtic was the heaviest locomotive to have been built in Ireland. As steamindex's summary notes, the size was accompanied by names that "added grandeur: Titanic, Celtic, Britannic, Atlantic, Majestic and Mercuric.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID2686
RailroadMidland Great Western
Number in Class6
Road Numbers127, 129, 125-126, 128, 124
Number Built6
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.25
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)40,096
Weight on Drivers (lbs / kg)76,496
Engine Weight (lbs / kg)114,016
Tender Loaded Weight (lbs / kg)80,192
Total Engine and Tender Weight (lbs / kg)194,208
Tender Water Capacity (gals / ML)3600
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 5.50
Minimum weight of rail (calculated) (lb/yd / kg/m)64 / 32
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)75 / 1905
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)18" x 26" / 457x660
Tractive Effort (lbs / kg)17,185 / 7794.99
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.45
Heating Ability
Tubes (number - dia) (in / mm)235 - 1.75" / 0
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)150
Grate Area (sq ft / m2)20
Evaporative Heating Surface (sq ft / m2)1363 / 126.67
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1363 / 126.67
Evaporative Heating Surface/Cylinder Volume177.99
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3600
Same as above plus superheater percentage3600
Same as above but substitute firebox area for grate area27,000
Power L16209
Power MT357.89

All material Copyright © SteamLocomotive.com
Wes Barris