On October 21, 2019, BJMTR jointly holds Depot Open Day with Beijing Municipal Commission of Transport for passengers at the Majiapu depot of Line 4. The passenger representatives visit the train maintenance work with AR technology and exchange views with the management of BJMTR at the meeting with GM session. On the same day, BJMTR launches official mini program, upgrades official website, WeChat, and releases a brand new mascot “little travel steward”- Jim.