The old railway line from Xian to Kunming had 300 plus tunnels and another 250 plus bridges. Today the new high speed rail linking both cities also had similar tunnels and bridges but the alignment is straight for high speed rails. In addition is the highway with the Ganghai bridge expressway. The Sichuan Tibet highway through Erlang Shan most probably completed by now. Many more great expressways and highspeed rails by now. Since the Great Wall nothing is impossible in China!!
