We sit on the train. Our glance wanders from the inside of the carriage and the landscape beyond the window. All we hear is the rhythmical rumble of the train wheels. This sound and gazing through the window cause drowsiness. Dreamily we stand outside ourselves. We can contemplate our lives from a distance, which we would not achieve in the midst of our daily errands. Few places are more conducive to internal conversations than a moving train. The view it offers is never dull. It moves just fast enough not to drive us to despair, but still slow enough to tell individual objects apart. It offers fleeting, inspiring insight into the privacy of others. There is an almost quaint correlation between what is in front of our eyes and the thoughts we are able to have in our heads: large thoughts at times requiring large views, new thoughts new places.
(from Art of travel, Alain de Botton)