There was only one 0-6-2T, the Barclay one, it didn't make it into CIE days...withdrawn sometime around '35 I think.
http://www.spellerweb.net/rhindex/Ireland/GreatSouthern/MacroomLoco.jpg
Sounds too good to be true, I don't doubt JSL took a pic of a wheel, would love to see it, but was the wheel attached to anything? Or just lineside debris?
There was a similar story told in the uk, derailment...loco couldn't be recovered and left be and a chimney protruding out of the ground was pointed to as hard evidence that the loco was still there...but the chimney wasn't attached to anything. It had broken off and was left there after the loco was recovered. A loco, even as scrap, is worth big money. I don't see how a railway company would just leave something that valuable even if it had to be cut up in pieces and carted out by hand. There was one well-known case of a Furness loco that fell into a large hole and that is still there, there is written proof the company just filled in the hole after it exhausted all options at getting it out. Maybe this is worth a thread in its own right.