Makes sense, rail is ideal for such a long thin country.
Probably a nine-hour overnight trip is preferable to a five-hour day trip, but of course there are shorter distances too.
I recall the last time they were thinking about this ±15 yrs ago, a delegate to a COP told me they were already concerned about adaptation to sea-level rise affecting part of the route along the coast. Seems better future-planning than some more ‘developed’ countries.