I tried a Hav-A-HART. After 3, the rest wised up and wouldn't go near it except the one that trained with Harry Houdini...
After repairing the cars' wiring a few times I gave up and started rat-trapping them and using a pellet gun. Hopefully for you it really is just one because I know I enjoy having them around when they aren't damaging stuff.
Good luck!
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