Beijing Daxing airport opens with high speed rail and metro links
https://www.railwaygazette.com/passenger/beijing-daxing-airport-opens-with-high-speed-rail-and-metro-links/54703.article
The reason why 2 paralleling railways is built at the same time wound be the prospect of huge demand of the airport.
Intermediate station on the metro line is named 'Daxing Xincheng', which means 'Daxing New Town.'
So, more passengers will board the metro train with development of Daxing Xincheng.
