I think the number on the tank side reads "6 A", if indeed that is a number. The wheelbase resembles that of the old Stephenson "long boiler" class 1275(?) goods engine from the Stockton & Darlington.
What really confuses me are the pannier-like tanks, and what appear to be chopper couplings.
At the moment, I'm thinking it's from the Wrexham Mold and Connah's Quay Railway, which did run some very strange engines with wheelbases like that in the photo.....