... I've not yet come across other model deliberations regarding that matter. In a practical sense, this will change wherever gauge widening comes into play. Additional data is being sought for some tyre comparison diagrams in preparation. Regards, Brian McKenzie Matt, I've given fleeting thought to visiting Sydney briefly leading to the Liverpool exhibition. Not sure if I can manage now, but any ideas that encourage are welcome. Last edited on 25 Aug 2014 07:00 by Brian McK posted: 25 Aug 2014 04:52 from: Brian McK 414_242342_470000000.jpg 3.5 mm "true" scale wheels, not P87, of NSWGRlys prototype Matt, Have just viewed Oscar Deluca's two videos on YouTube. http://www.youtube.com/watch?feature=player_detailpage&v =es-IAV0LjF8 http://www.youtube.com/watch?feature=player_detailpage&v =OKcGt8CVwPA I greatly admire the fine workmanship he has applied to the truly scaled concentric wheels- and to the matching turnout construction. Another Brian Harrap. Photos snipped illicitly from video. -Brian McKenzie Last edited on 25 Aug ...