There was some discussion a while back about suggestive names carried by A3 pacifics (which as most people know where named after racehorses: see
Anyway, here's another.
I recently came across of a list of jocular names in French for the male member. Lurking between "rat-sans-pattes" and "thermometre-=E5-moustaches" was "saint-frusquin". As Gresley fans will know, A3 No. 60075 was named "St Frusquin". The Hornby A3 is available with this name.
I suspect that this is a pretty obscure term even in France, as a quick Google search didn't seem to turn up any reference to it. Neither did it seem to find any actual saint named Frusquin.
Andy Kirkham Glasgow