Right, where to begin!   Yes, there have been threads on this subject before. They have tended to get locked after a "gauge war" has broken out. And that's a pity because we may as well recognise that the vast majority of 4mm scale railway modelling involves the use of 16.5mm (OO) track and, given the existing manufacturers' commitment to that standard, it's not going to change anytime soon.   If your preference is EM or P4, that's great - but this thread is not for you.   I have started t