Though total population of Lanzhou is just less than 4 millions, there seems to be 4 high speed lines departing from Lanzhou.
・Baoji–Lanzhou High-Speed Railway(Opened in July 9, 2017)
・Lanzhou–Xinjiang High-Speed Railway(Opened in December 2014)
・Lanzhou–Zhongchuan Airport Intercity Railway(Opened in September 30, 2015)
・Lanzhou-Chongqing High-Speed railway(Opened today)
China Western Development seems to be in good pace.