A train full of people just disembark, and are going up/down the stair on the left to the concourse leaving the right hand stair empty.
Next thing you know, a lone commuter rushes down to make the train against the flow of people, pushing others out of the way despite a lane being reserved for them on their left, and they usually ended up not making the train as they spent all their time pushing through people. I thought it's common sense that we drive on the left therefore we walk on the LEFT too ?
I used to move to make way for them through (usually mean I'm pushing someone else out of their way). Now I just stop and stand and make them go around me. TAKE THAT WRONG LANER!
/rant
ok this is my world class analysis/theory:
that person must be right handed. so when he rushing down he will prefer right side because then he can use his right hand to hold on to the rail. its just brain reflex to choose the "strong/safe/dominant/used to" side when people are in hurry.