a brief note on escalator ettiquette.
the "keep left" signs are there for a reason. not everyone wants to wait an extra three minutes watching you get lovey-dovey with your other half - some of us simply want to get past.
functionally, escalators are there to move people up and down stairs faster than they would simply on foot. like a moving walkway, they are not there as a comfort accessory - they are not there for you to have a rest after your long, weary day sitting at a desk in an office or sitting in a train from [fill in the name of a station here] - they are there to get you from a to b without having to actually say "to".
if you must rest, read the above section on keeping left.