Rail variations for expanding a real rail layout. I made large curved rails that allow you to lay rails on the outside of double-track rails. Set Contents Real double-track outer curve rails: 8 凸凸 joints: 8 The length of the rails is about 1.5 times that of standard rails. The turning radius is 12 cm larger. The rail running surface is only on one side. The sleepers, which were floating in the air with the genuine rails, are placed on the ground with these rails. Only at both ends of the rails are there indentations for connecting to block piers. By using the small-diameter curve rails that I am making separately, it is possible to create a quadruple-track curve layout with real rails in combination with standard rails. *Because the package size is almost at the limit for Yu-Packet, we may refuse combined shipping. *This product is a personal production part made with a 3D printer. Please be aware that there may be stripe patterns, color differences, and surface roughness due to manufacturing reasons. *PLA, a plant-based plastic, is used for the material. Please be careful as it is prone to deformation at high temperatures.