Which city in China,  Qingzhen or Guang'an, is the more specific location in terms of the hierarchy of Chinese infrastructure?
Qingzhen Qingzhen (Chinese: 清镇; Pinyin: Qīngzhèn) is a county-level city under the administration of Guiyang in Guizhou province, China.
New Guanjiao Tunnel New Guanjiao Tunnel () is a tunnel on the 2nd line of Qinghai–Tibet Railway in Guanjiao Mountain, Qinghai province. It is dual-bores, double-track rail tunnel. The total length of the tunnel is 32.645 km , which makes it the longest railway tunnel in China.