Hello! My son is 8, autistic boy with intense interest in trains, train crashes and all-trains related. I am looking for suggestions on what else I can offer to facilitate this interest. He nailed train simulators: on iPad and PC including railroads online, derail valley, trainz. I got him the book “Train wrecks” by Robert Reed (big hit BTW). He has access to YouTube videos according to his interests and access to transportation museum with trains on display. What else can be of interest besides toys? Thank you!