As a metro line that runs through the north and south of Beijing's rail transit network, Line 4 and Daxing Line operated by BJMTR is an important means of transportation for residents along the line. With the integrated development of cities and towns in the Beijing-Tianjin-Hebei region, the travel demand of residents in Daxing District and Gu 'an in Hebei province have increased, especially for commuters who take the first train. To arrive their destinations on time, some passengers choose to arrive at the station before the operation time. Therefore, to meet the demand of residents in Daxing District and Gu 'an in Hebei province for earlier commuting, to further strengthen epidemic prevention, and to allow passengers to choose more flexible commuting time, BJMTR will adjust the first and last trains on Line 4 and Daxing Line from August 10, 2021.