The Classic Train Set (Track Plan) The layout is made entirely from standard Dublo track with one exception.The single, short, straight by the colour signal on the turntable is a cut down half straight. It is used to feed the turntable back into the engine shed. It is roughly the length of an eighth straight and has a power wire solered to a copper-clad sleeper glued under the power rail so the feed is isolated from the base.