Rail Door Systems are iron door systems with rails on the lower floor of the part where the door moves. The rails of the rail sliding doors should be made of the transmission shaft and u-bar or u-bar. If an angle bracket is used on the rail of the rail doors, the movement of the rail door becomes difficult over time as the wheel of the rail door presses on this bracket from three points. At the same time, cars passing over it can deform the gusset very quickly. this prevents the rail door from going and coming.