China's first through the tunnel of Qinling extra long high iron through

Beijing, Xi'an, September 18 (reporter Zhangyuan) to Chengdu, Xi'an railway passenger dedicated line focus control project -- An Lao Mountain Tunnel on the 18th to achieve through and become high iron's first successful through the Qinling extra long tunnel. Old mountain tunnel is located in, Foping, Ningshan County, belonging to the south of Qinling Mountains low mountainous area, elevation in 825 meters to 1990 meters between irregular undulating, 15161 meters in length, West into passenger dedicated the second super long tunnel.