This class, with just one example, was designated DN5 by the Great Southern Railways (Ireland)
(from 1925). Following the GSR classification by wheel arrangement, "D" meaning a locomotive with a 4-4-0 arrangement, "N" meaning Narrow Gauge. The 4-4-0 wheel arrangement is unusual for tank locomotives but more common on narrow gauge than standard.
The locomotive was built for the Schull and Skibbereen Railway by Nasmyth Wilson and Company of Patricroft Iron Works, near Manchester in 1888 being numbered "No.4" and named " Erin".
The locomotive was withdrawn and scrapped in 1953.
Driving Wheel Diameter : 3ft. 0 1/2in.
Cylinders : 12 ins. x 18 ins.
Working Boiler Pressure : 140 p.s.i.
Weight: 24 Tons