Hi. My 2.5 yr old grandson is obsessed with trains and has been mesmerized since he was 10 months old. He lives with me and my dream is to build him the tracks that go around the wall/ceiling. Im great at building things, however, i know nothing about electric trains. So i have two questions what is a great starter train set for this project that is reasonably-priced (that i can add to later) ? And is there the option to buy extra tracks for that set since i will obviously need a lot of them?