Beijing, March 18 (Youth.cn) - The last meter of Banyou No.1 tunnel has been successfully excavated. Located in Aba Tibetan and Qiang Autonomous Prefecture in Sichuan Province, the tunnel is on Sichuan Section of Xining-Sichuan Railway. It is the first tunnel on the Sichuan section of the newly-built railway, marking the tunnel construction of the whole line has entered the critical stage. Photo/CFP