That is a trend. Ever been on one of China's subways or intercity trains? Scrutiny has increased over time, and the checks especially for intercity travel are

That is a trend. Ever been on one of China's subways or intercity trains? Scrutiny has increased over time, and the checks especially for intercity travel are near what one expects for a plane ride. A thorough security system would also look into other data associated with the ticket buyer. Somewhere in there is a privacy issue. How much info does the state need on a passenger to quantify risk, based on an intention to board a train or plane?