Captain Kernow
Western Thunderer
Problem is, Dave, you don't know what the wheels of new RTR releases are going to be like. My Accurascale Manor actually derailed each time it passed over any 16.2mm track, not just the crossing area!Martin Wynne of Templot fame is (quite rightly) always banging on about the importance of 'Check Gauge". This is is equal to the back-to-back dimension plus the effective flange thickness (of one wheel). Locos and rolling stock won't consistently and safely pass through crossings without adherence to a standard dimension.
Deviate from a standard value at your peril!