7 reasons to visit Hoi An, one of Vietnam's most beautiful towns
https://edition.cnn.com/travel/article/hoi-an-vietnam/index.html
Vietnam has many destinations between Hanoi and Ho Chi Minh City. But,
North–South railway in Vietnam doesn't have frequent trains.
And then, it doesn't play an important role for passengers visiting these cities.
As Vietnamese Economy develops, there will be much more people moving between these cities. So, new rail line(s) serving frequent and higher speed trains will be needed.