The Beijing subway is all the more popular because it is very good value.
Most passengers, who only travel in the center of Beijing, have to pay 3 yuan.
All inclusive tickets are 5 yuan, far cheaper than European subways for example.
Tickets are shown at the entrance of the subway but there are no checks afterwards.
Although most modern lines have electronic doors, Beijing Subway Group still hires many employees to
manually check tickets on the first two lines.