Seoul starts work on regional express network
https://www.railwaygazette.com/news/infrastructure/single-view/view/seoul-starts-work-on-regional-express-network.html
Suburban railways using tracks or trains of high speed rail are becoming common in China. In South Korea, Regional Express Network(GTX) is a kind of that. But, I guess what South Korean railway companies should prioritize is launching express trains on conventional tracks. Though there are many rail lines around Seoul, there are a few lines where express trains are available at high frequency.
Until inauguration of GTX, they should install express trains as a tentative measure.
