Polar Express Magic Mountain disappearing Train Layout By Angela Cotey | October 17, 2011 | Last updated on November 7, 2022 Extra enjoyment for those who "truly believe." Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates This 4 x 13-foot layout is built in three sections. Trailer wiring harnesses connect the sections and 2-inch thick styrofoam was used as the structural surface material.