![](http://www.ecns.cn/hd/2019/11/06/e72c9c75d5064421b7af638563d48547.jpg)
Technicians work to maintain trains on Beijing Metro Line 4 at a workshop in Beijing, Nov. 5, 2019. The workshop is able to handle the maintenance of 86 trains for Line 4 and the rapid transit line that connects the city’s southern Daxing District. (Photo: China News Service/Hou Yu)
![](http://www.ecns.cn/hd/2019/11/06/79ac8c48c0c544a9b5bf13beb1ced973.jpg)
Technicians work to maintain trains on Beijing Metro Line 4 at a workshop in Beijing, Nov. 5, 2019. The workshop is able to handle the maintenance of 86 trains for Line 4 and the rapid transit line that connects the city’s southern Daxing District. (Photo: China News Service/Hou Yu)
![](http://www.ecns.cn/hd/2019/11/06/b2c3d70b2e8f4704b2c5dbe05be27c6a.jpg)
Technicians work to maintain trains on Beijing Metro Line 4 at a workshop in Beijing, Nov. 5, 2019. The workshop is able to handle the maintenance of 86 trains for Line 4 and the rapid transit line that connects the city’s southern Daxing District. (Photo: China News Service/Hou Yu)
![](http://www.ecns.cn/hd/2019/11/06/725d3e077bc740889565039e57ff69bb.jpg)
Technicians work to maintain trains on Beijing Metro Line 4 at a workshop in Beijing, Nov. 5, 2019. The workshop is able to handle the maintenance of 86 trains for Line 4 and the rapid transit line that connects the city’s southern Daxing District. (Photo: China News Service/Hou Yu)
![](http://www.ecns.cn/hd/2019/11/06/2b21872dce804de2a258927b63e66502.jpg)
Technicians work to maintain trains on Beijing Metro Line 4 at a workshop in Beijing, Nov. 5, 2019. The workshop is able to handle the maintenance of 86 trains for Line 4 and the rapid transit line that connects the city’s southern Daxing District. (Photo: China News Service/Hou Yu)
![](http://www.ecns.cn/hd/2019/11/06/50d218296d84481fb1c1a9e8dfd8c399.jpg)
Technicians work to maintain trains on Beijing Metro Line 4 at a workshop in Beijing, Nov. 5, 2019. The workshop is able to handle the maintenance of 86 trains for Line 4 and the rapid transit line that connects the city’s southern Daxing District. (Photo: China News Service/Hou Yu)
![](http://www.ecns.cn/hd/2019/11/06/2cb746d9221d41b6be09a146b729b7b2.jpg)
Technicians work to maintain trains on Beijing Metro Line 4 at a workshop in Beijing, Nov. 5, 2019. The workshop is able to handle the maintenance of 86 trains for Line 4 and the rapid transit line that connects the city’s southern Daxing District. (Photo: China News Service/Hou Yu)