We now place a Lionel train around the tree very year (Pennsylvania Flyer, of course).
Our family loves trains. The kids are big now, but we had all kinds of trains all over when they were small: wooden toys, plastic toys, Lego, ...
We love going to train places. Seven years ago we took the Amtrak auto train from Lorton, VA to Sandford, FL - awesome trip. We have been to Steamtown. we have ridden all kinds of excursion trains in Ohio, Pennsylvania, and West Virginia. Our favorite is the Cass Scenic railroad in West Vrginia, which runs Shay locomotives from the years of the logging boom.