During his first five years in power, Prayuth approved capital expenditure covering 1 700 route-km, partly comprising double-tracking of the existing main line network but also including construction of new conventional railways, six urban rail lines in Bangkok and advancing the planning of two high speed lines. Other planned work in the north of the country includes the 285 km Nakhon Sawan – Den Chai line, while in the south of the country, the 168 km between Chumphon and Surat Thani is to be doubled in order to increase capacity on a busy tourist route; Surat Thani is the interchange for ferry links to the island of Koh Samui.