Train for around Christmas tree?

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Anyone have a good one for kids that goes around by itself?  Looking to get one this year, TRU has a couple, but not sure if they are in stores yet, or where I could find one

Jamaica_Bride

We have put our Polar Express train around our tree in years past.

Andrewsgal

We have the lionel christmas train, and love it, so does DD.

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where is the Lionel from? or the Polar Express?