1, the line scale is different: Line 4 is one of the earliest subway lines in Beijing, with a total length of 28.2 kilometers and 28 stations, which mainly run through the central area of Beijing and connect many famous scenic spots, commercial centers and residential areas in Beijing. Daxing Line 4 is a relatively new line in Beijing subway network, with a total length of about 29 kilometers. It has 24 stations, mainly serving Daxing District in the south of Beijing, connecting many important areas in Daxing District, such as Yizhuang Economic Development Zone and Beijing New Airport.
2. Different status of lines: Line 4 is an important line in Beijing subway network, connecting many important areas in Beijing and often used for urban traffic. Daxing Line 4 mainly serves Daxing District, connecting many important locations in this area.