The Washington Post has an article on trains -- no not the big ones, but the ones that you can fit in your living room or basement or whereever. Ours right now is packed up in its boxes - perhaps because our Christmas tree is so broad that there is no room for a train, particularly when we had an array of massive boxes stacked around the tree. But now that the boxes are gone, maybe we'll pull it out and see what the cat thinks of it!
We have a garden size train, but I have some fascination with the really tiny ones that you can set on your desk! See for example this little 7.5" by 4.5" number at Lilliput Motor Company, all set up for you. Or how about this adorable circus train set up.