Fortunately, building a kid-friendly layout and buying THOMAS series trains for the youngsters in the family to enjoy -- in my case, two great grandsons, Matthew (age 6) and Hudson (age 5) -- is an effective "cover story" to my wife for my indulgence in the hobby. My L-shaped layout provides running room for the THOMAS (and other) trains, and the Christmas holiday season is a legit excuse for trains at the base of the tree.
Currently, the competition of their attention isn't soccer, but dinosaurs (books, videos, toys, T-shirts). So I bought Lionel's "Dinosaur Train Set" and placed toy dinos in a DINO PARK on the main line. They place the animals on that train for a ride and explain that the dinos need transportation to their summer feeding grounds.
Mike Mottler
mottlerm@gmail.com