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The next problem is that a full length of straight or curved rail is longer than a 9v train motor-- so depending on the speed you're running your train, and how much weight you're carrying, your motor may get stuck on a non-powered track. You can remedy this with an extra motor spaced correctly, which will mean you've probably always got one motor that's powered, although a non-powered motor will provide a lot of resistance if the wheels aren't spinning.
I'd recommend either spending the money on 9v track, or modifying your plastic track to add metal strips to provide the connecting current (I believe that's been done successfully by various people).