Hangzhou opened four metro lines at the same time by the end of 2020, and the total mileage of metro operation has exceed 300 km, entering the "300 km era". Ten districts under the jurisdiction of the city have achieved "full rail coverage", and the subway "double line" is connected to Xiaoshan Airport, an international gateway hub. Times Electric traction auxiliary and network products have always been adhering to the concept of excellent performance, stability and reliability, to protect the train in the double track passenger transport camp.