... you want to try and maintain a 6foot minimum radius you have to go up to a B6, almost just to play safe Hi Richard, Welcome to Templot Club. It's not necessary to go all the way to B-6 to get above 6ft radius. Changing to a 9ft-type straight switch instead of the A switch, and a generic type V-crossing instead of regular, gets you to 73.9" radius at 1:5.5 RAM crossing angle. This turnout isn't significantly longer than the A-5: 2_310702_310000000.png These are for 0-MF gauge (31.5mm track gauge). In truth, A-5 is an unsatisfactory size, it is too far below the natural angle for an A switch (A -7 ), resulting in a short sharp length of turnout radius. You can see that changing to an older straight type of switch makes a much gentler space-saving design. You don't have actually to build it as a loose-heel switch, you can simply use the same geometry but for a flexible switch ...