Frank, if you are looking at original Gilbert rubber roadbed or the Johnson reproductions they are made only for full straight and curve sections. Wherever an uncoupler or actuating track section is attached the roadbed must be cut to clip them on. For partial straight and curves, cut the roadbed to fit.
For turnouts, the trick is to attach the three adjacent track sections to the layout and allow the the turnouts to float free (about 1/16") above they layout. Some people put thin cardboard under the turnouts but it is not necessary for reliable operation. Cut the beveled edge off a straight section to place alongside the turnout to blend them in to the other track sections.
Here is a picture that shows the roadbed, free floating turnouts, an uncoupler cut into the roadbed and the beveled edge of the roadbed along the two turnouts. Treat rerailers the same as turnouts.
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