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One way to get flexi to stick to a radius is to solder 2/3 lengths together via the rail joiners while it is all straight, and then bend the solid piece round to the nice smooth curve you want. I am aware that this creates a theoretical problem with track expansion but in practice I have never found it to be a problem and it is hot here (40C+). I guess I would say don't lay it while the railway room is excessively hot or cold. Also if you do it this way you can lay to your marked radius and let the end of the curve drift out a little to create transition curves the non engineer's way.
The point of a transition curve is that when a train comes to the end of a straight at any speed it sets itself smoothly up for a curve by taking up all the rim/rail clearances rather than suddenly lurching into its new alignment with the track.

Andrew
 
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