Line 1 of the Beijing subway runs from Pingguoyuan in the west through to Sihui East in the east. It is the longest east-west subway line in Beijing. It runs through beneath the extended Chang'an Avenue and through the commercialised areas of Xidan, Wangfujing and Dongdan. Two stops on either side of Tian'anmen make this line the only line that runs through the core of Beijing.