NIR (Northern Ireland Railways) MPD (multipurpose diesel) railcar. Built between 1957 and 1962. The last being withdrawn in 1983. I'm gradually going back in time with my builds. Might even get onto a steam one some of these days.
NIR MPD by snowylego, on Flickr
NIR MPD 2 by snowylego, on Flickr
Just need to buy some NIR transfers for the sides.