Steady thoughts carried by locomotives

I haven't read much lately.
Any time I plan to sit down and open a book my mind wanders.
Even if I get to the point where my eyes scalpel words from the page they fall asunder, spun out in the blender of my mind.  I cannot focus and when I try to read, the words fall into the abyss of pointless procrastination.
However, recently I have come upon a remedy.
The comfort of transit; when I am not squashed between the sweaty bodies of Viennese commuters gripping whatever my hand can reach and my fingers can wrap around, swaying with the crowd like a leaf in the wind as the u-bahn, tram or train grinds to a halt or squeals into motion. When I am seated and comfortable, gliding through Vienna to and fro, I find the carriage a cradle for my thoughts; rocking and rolling over the metal tracks, steadying my wobbly mind and allowing me to read and write.

Maybe it is because I have little else to do and I shyly refrain from staring at the nomadic disposition that is the commuter, maybe I have become bored of the scenery flashing by me or maybe my tired mind relishes the moment to turn off the outside world and immerse my consciousness in a book, nursing the lines as they waft off the page.

I am not sure why it helps.
It may simply be that a still body cannot ignite and propel a mind into motion.