Line 3 (Guangzhou Metro)
…track and stations, is located in tunnels. Its 67.33 km (41.84 mi) main branch, excluding the 7.5 km (4.66 mi) branch between Tianhe Coach Terminal and Tiyu Xilu is now the second longest continuous subway tunnel in the world, and the longest rail tunnel of any kind (surpassing the Gotthard Base Tunnel in…