Ground plane problems can happen when there are multiple parallel tracks or multilayer tracks. If you test the switches all by themselves and they don't work I would think it isn't a ground plane problem. The ground plane issues I have had with the O gauge switches still had the lights lit, the switches just wouldn't work at the particular spot in the layout they were located. Have you checked the continuity of the rails to see if power can pass from one end of switch to the other?
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