Laying foam roadbed on curves question


I have a question in regards to laying foam roadbed. I was testing and laying some down around a curve. I notice that on the curve it can start to "bunch up" and kind of make a pinch stick up in the corners (hope that makes sense) Is there a way to stop this from happening?
 
Use a sharp knife and cut out a pie wedge on the inside of the curve. The roadbed will lay down nice once you glue it down.
 
yep small cuts to let it curve nicely. at switches just cut the cork to a point so that it flows away nicely to the diverted route
 



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