RWG Bryant 2mm Scale Drambuie Diorama at NRM

The late Mr. R.W.G Bryant's 2mm-scale diorama of the Inversnecky-Glenlivet Distillery Company in Drambuie, Scotland, which was begun in 1946, is now displayed at the National Railway Museum in York, England.  The steam locomotive appears to be a North British Railway (NBR) 0-6-0 tender engine, whereas from what I have seen of the original diorama, Mr. Bryant usually ran one of two Highland Railway tank engines: Stroudley R/Lochgorm-class 0-6-0T No. 56 Dornoch or a Drummond X-class 0-6-4T.