As Shenzhen prepares to break ground on a new high-speed railway station later this month, some residents of the southern Chinese tech hub worry it may not be big enough.The 13.2 billion yuan (US$1.9 billion) Xili Station in the city’s downtown Nanshan district, set to be inaugurated in 2028, is not another of the mammoth projects that were common during the heyday of China’s infrastructure buildout.But the futuristic integrated transport hub will help make trips to other cities in the Greater...