You can reverse the wires going to the track. The relay will still work, but the reversed polarity of the magnet should demagnetized it. Also you should check out the bypass resister to ensure that the relay is only getting pure DC for just a moment when the relay pick ups. Lionel usually uses a nichrome resistance wire in this application. The resistance wire is usually attached to a copper wire at both ends with a crimp butt splice. The resistance of this connection can go up with age, reducing the amount of AC power that can bypass the rectifier. Check the resistance wire resistance on each end of the nichrome wire. Then do the same check on the copper lead wires. The difference in these measurements is the resistance of the butt splices.
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