... and electricity, light weight, length: 15~18 meters. Aluminum third rail: 1, Material: 6063, 6101B 2, Size: width about 80mm, height ... : T6 4, Surface treatment: mill finish 5, Application: monorail, underground rail, subway or metro system. For example: Beijing No.9 and ... . 15 line, South korea and Iran subway etc.. aluminum third rail used metro system