Trains, what’s not to like? This Saturday May 18, Prudent Living of the Upper Valley debuts a gigantic model train set at LaValley’s Building Supply in W. Lebanon. The 750-square-foot display shows how energy is made and used in America and alternative building strategies for the future. The exhibit features four train loops of lights, mountains, tunnels, canyons, rivers, a coalmine and a miniature oil rig that drills down into a cave of dinosaur bones.There will be giveaways for the first 500 children, including tee shirts, magnets, balloons and toy dinosaurs. The exhibit hours are from 9 am to 3 pm. and will be on display indefinitely.