Editing Haecheol (section)

===THX===
[[File:Bullet Train.jpg|thumb|An "ultra high-speed" train specially designed by Suri HI for the THX]]
The Trans-Haesan Express, abbreviated to THX, is the signature service of Haecheol, a "super high-speed" express train connecting Suyang and [[Anfa]], Haesan's two largest cities.  The original line, which opened in 1991, cut as close to a straight line as possible through the Maehwa Mountains after leaving Suyang Central Station, stopping in [[Seowon]], [[Hyangsan]], Jeongseon, and Marchal Station in suburban Anfa before arriving at Gare Central in downtown Anfa.  Due to increased demand for north-south connections, the THX expanded in 1997 with a route that connected Hyangsan to [[Apseong]] and [[Sanri]] before connecting back with the main line at Marchal.  In 2001, the THX added a spur to [[Levesque]], and began offering high-speed service from Suyang to Levesque as well.

The THX has undergone a series of upgrades since its inception, with its most recent round of improvements concluding in 2018.  The THX currently spans {{convert|728.6|km|mi|0|abbr=on}} of high speed track across 6 [[Provinces of Haesan|provinces]].