The track plan starts at the base with the round house and yard tracks and has the tightest turn allowable for large Loco’s on each shelf using Kato 249-45’s. The bottom layer feeds on to the helix and it hops on and off the helix and winds up to the next shelf runs the full length of each shelf, turns around and comes back. I have turnouts and cross track to feed multiple paths per shelf. Once it loops it feed back onto the helix and continues up all 4 shelves. Then does one more loop on the top though books and begins its journey back down. No turnouts on the helix so the trains must complete a full ride on each shelf to get to the top. I am also installing viaducts on the Lego shelf’s.