Taking into account that the line had only light trackwork, heavier locomotives were out of the question without changes to the wheel arrangement, although extra power could be made available with changes to the cylinders or boiler tubework to increase the heating surface and so the tractive effort.
These two locomotives, built by Kerr Stuart at their California Works, Stoke-on-Trent, provided the extra motive power and retained the 2-6-0T wheel arrangement.
Like the Hunslet built locomotives (1 to 3, 6, and 8) these were fitted out to be suitable for tramway working with "skirts" covering the driving wheels and motion, cowcatchers, bell, headlight etc.
The "skirts", normally a legal requirement for road-side tramways, were removed after only a short time to give crews easier access for lubrication of the motion etc.
As photographic evidence does not show their return it must be presumed that the Board of Trade inspectors didn't get to this corner of Ireland very often.