Line 201 tram operator Gao Xiaoyun (L) helps a passenger get on in Dalian, northeast China's Liaoning Province, March 7, 2018. The Line 201 of Dalian's transportation service features a fleet of 15 classical trams which were made a century ago and are operated by a women crew. Running over 20 hours a day, the tram line also has the longest daily operating time record in the city's public transportation system. (Xinhua/Yao Jianfeng)

Line 201 tram operator Zhang Ping cleans the vehicle's windscreen after a service span in Dalian, northeast China's Liaoning Province, March 7, 2018. The Line 201 of Dalian's transportation service features a fleet of 15 classical trams which were made a century ago and are operated by a women crew. Running over 20 hours a day, the tram line also has the longest daily operating time record in the city's public transportation system. (Xinhua/Yao Jianfeng)

A Line 201 tram is pictured during night-time operation in Dalian, northeast China's Liaoning Province, March 7, 2018. The Line 201 of Dalian's transportation service features a fleet of 15 classical trams which were made a century ago and are operated by a women crew. Running over 20 hours a day, the tram line also has the longest daily operating time record in the city's public transportation system. (Xinhua/Yao Jianfeng)

Line 201 tram conductor Zou Benhong (rear) is pictured with passengers during a night shift in Dalian, northeast China's Liaoning Province, March 7, 2018. The Line 201 of Dalian's transportation service features a fleet of 15 classical trams which were made a century ago and are operated by a women crew. Running over 20 hours a day, the tram line also has the longest daily operating time record in the city's public transportation system. (Xinhua/Yao Jianfeng)