西直门是个换乘站。

Xizhimen is a transfer station.

然后，从换乘站设施设备及换乘站客流两个方面分析了城市轨道交通换乘站运营协调效率的影响因素。

Then, the influencing factors of operation and coordination efficiency of transfer stations are analyzed and studied in detail from two aspects as facility and passenger flow.