Because O gauge is larger, do the diesel locos (particularly 31, 37, 47, 56, 60) have more detail than OO and are they more robust because the pieces are larger?
It seems like Heljan is the only O gauge loco supplier for the classes I'm interested in?
(I'm thinking of moving from OO gauge because Bachmann models seem so delicate with regards to problems and I think the prices are now too high for what you get)