Mordern time,human has more and more convenient ways to "deliver" yourself from place A to place B,especially since the useful airplane was invented by brother Wright's in 1907.
Now,you can choose bus,long distance bus,private car,ship,train and airplane to start your trip to anywhere all over the world.
airplane is for sure faster than any of others transport ways,but it is not all people's favorite or say first choice,some people are always afraid they would be crashed when they "luckily" take the broken airplane.And,some people can not take airplane because of their sickness.Women who are pregnant at their early months or later months and very old people also have no big chance to take airplane,so they all have to choose another way to go somewhere,train seems to be the best choice among those rest.
Nowadays,trains become more comfortable than it usd to,we even have hard sleeper and soft sleepers,after the D train started to run few years ago,a trip by train makes more sense for us.