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The relay modules from China on eBay are very nice for the price. They require DC power (generally 12vdc or 5vdc) to operate. The load side (NO/NC and COM) can handle up to 10 amps. The input side uses opto-isolation prior to driving the coils. They come in various configurations from 1 to 8 relays per module as shown below:

  -- Leo

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  • mceclip0

I would mix the two ideas of the insulated rail and the relay. I would use a time delay relay from ebay. Use the insulated rail to trigger the relay, that way you'll get smooth operation of whatever device you choose.

If you really want to get fancy, use two  insulated sections, one on either side of the road, or one really long insulated rail. That would make it behave realistically.

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