BEIJING, July 18, 2016 (Xinhua) -- Newly-installed platform screen doors are seen at Yong'anli Station of Beijing subway Line 1 in Beijing, capital of China, July 18, 2016. Beijing began installing platform barriers on Line 1 of its subway, the oldest metro line on the Chinese mainland, which has been plagued by a spate of suicides and accidents in recent years. The entire project is expected to be completed by the end of 2017, the line's operator said. (Xinhua/Luo Xiaoguang)