The lack of a shower and having to carry all your luggage when you leave the train. I have in the past ridden overnight trains and slept in them, reducing the n

The lack of a shower and having to carry all your luggage when you leave the train. I have in the past ridden overnight trains and slept in them, reducing the need for accommodation by one night. I think if you pack lightly, you can certainly do this alternating "traveling" and "staying" every couple of days for a while, but you will quickly cover a lot of ground that way. There will be times you want to hop on a shorter train for a couple of hours and no more, because a place you want to see is close-by.