Very interesting request at RMWEB:
http://www.rmweb.co.uk/community/index.php?/topic/70393-nir-coaches/
I would like to add the question about the First and Second brake generator vans-
does they all look the same (except from the yellow stripe) ore are there differences in particular the grills.
At one picture of 912 there are also grills at the opposite side, at another picture it looks like one carriage has "Aircon style" windows.