North Korean railway line opens
http://www.railwaygazette.com/news/infrastructure/single-view/view/north-korean-railway-line-opens.html
It seems to be common in Korean Peninsula to replace narrow gauge rail with standard gauge rail.
Suwon-Incheon Railway is one of those examples. It had been operated as narrow gauge until 1990s. After construction of standard gauge rail, it reopened in 2010s.
Now that most of the railways in Korean Peninsula are standard gauge, it would be better to convert remaining special gauge into standard gauge for through service.