The reference for locomotives and railcars


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Other Narrow Gauge Steam Locomotives from Ireland and Northern Ireland[Inhalt]
County Donegal class 4
Ireland | 1904 | 4 produced
No. 15 “Mourne”
No. 15 “Mourne”
Locomotive Magazine, October 1905

The Railways Joint Committee for County Donegal procured four tank locomotives to cope with the increasing weight of freight trains. With seven axles and a mass of nearly 45 tons, they were a substantial size for the three-foot gauge

According to reports, the boiler originally had a poor steaming performance, which was attributed to an excessive number of heating tubes. Performance improved with the removal of the top row of tubes. In the 1920s, they were all fitted with a superheater, which again significantly increased performance.

The four locomotives were numbered 12 to 15 and named “Eske”, “Owenea”, “Erne” and “Mourne”. Three locomotives were scrapped in 1952 and 1954, but the “Erne” survived until 1968.

ManufacturerNasmyth, Wilson & Co.
Axle config4-6-4T (Hudson) 
Gauge3 ft (Three feet)
Dimensions and Weights
Wheelbase25 ft 2 in
Fixed wheelbase9 ft
Service weight99,680 lbs
Adhesive weight58,240 lbs
Axle load19,415 lbs
Water capacity1,801 us gal
Fuel capacity6,048 lbs (coal)
Power sourcesteam
Estimated power350 hp (261 kW)
Optimal speed16 mph
Starting effort14,280 lbf
Power Plant
Driver diameter45 in
Boiler pressure160 psi
Expansion typesimple
Cylinderstwo, 15 x 21 in
Grate area12 sq ft
Firebox area80 sq ft
Tube heating area643 sq ft
Evaporative heating area723 sq ft
Total heating area723 sq ft
Calculated Values
steam locomotive
tank locomotive
narrow gauge
last changed: 03/2023

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