... spacing between the two curved running lines is at standard spacing. This needs to be widened considerably for the radius used. I will have a closer look later. Better to find out now than later. I know of a layout where sadly this was not discovered until the track had been laid. They who never made a mistake, never made anything. Regards Tony. posted: 17 Jul 2017 17:31 from: Martin Wynne Hi Kelly, Use tools> spacing-ring dummy vehicle to check for clearance conflicts: 2_171227_450000000.png regards, Martin. posted: 17 Jul 2017 18:58 from: John Palmer When I posted the boxfile forming the basis of Kelly's current design on the Scalefour Society forum, I should probably have issued a stronger warning than I did that clearances should be tested- I plead guilty to having adopted standard spacings, as my principal concern was to arrive at a layout meeting the required operational criteria. The attached boxfile widens the running line centres to 49mm. This seems to maintain 6" clearances between dummy vehicles of 4 ...