All I can think about when I read about this plan is a train full of potential hostages whenever the Kim regime needs to use them:

The Park Geun-hye administration unveiled Monday a series of new proposals for inter-Korean projects, including an ambitious plan to operate trains from Seoul to cities in the North this summer by linking severed railway lines.

Four government offices including the unification, foreign and defense ministries briefed Park on their proposals for unification preparation and projects they would like to push this year. The briefing was arranged after the government stated that this year should be a turning point in the unification of the two Koreas.

This year marks the 70th anniversary of Korea’s liberation from Japanese colonial rule and the subsequent national division.

“President Park declared her intention to prepare for unification at the New Year’s press conference on Jan. 12, and the ministries also agreed that the time has come to look back on seven decades of national division and prepare for unification,” a senior government official said.  [Joong Ang Ilbo]

You can read more at the link.