To accommodate a growing model train set, join two train boards together by installing two or more 1-1/2 x 1-1/2 hinges across the joint between the two pieces. Simply remove the hinge pins when you want to take the sections apart. Once you begin to attach tracks and run wiring, don’t fasten down the length of track that joins the two sections. It’s best to install electrical connections so they can be taken apart between the two sections.