There's some very interesting footage in that website, including film of the County Donegal around the time of closure. I'd never seen film of the shunting tractor Phoenix moving until now....
They seem to have been widespread. There's at least one photo of a 650 taking the road to Ballina at Manulla Junction, when the station buildings still existed.
That looks like the upperworks - the cab, tanks and footplate - were intended for a standard gauge engine with a higher-pitched boiler, and adapted for narrow-gauge use.