It doesn’t have a name, but there’s a scale occasionally seen in UK of 5.5mm = 1ft, 1:55 scale. It’s usually combined with 12mm (TT) or 16.5mm track for narrow-Gauge modelling, there were a couple of small manufacturers offering kits
It looks very nice for narrow gauge modelling but I suspect that length would be a problem, especially bogie coaches and longer locos.
Tri-Ang produced a range of OO coaches in the 1960s which were significantly under-length to suit the 15” #1 Radius which remains in the Hornby range as their standard minimum size, as do the short coaches. In fact Tri-Ang were pretty much the British O27 of their day.