I must admit not knowing the unspoken rule for escalator traffic (stationary on right - walking on left) on the east coast when I first visited. So, maybe that rule should be posted for those from flyover country where escalators are seldom used on a daily basis.
You can often times see people walking up the left lane of an escalator with stationary people on the right, especially during rush hours. One needn’t be an Einstein to figure it out and step to the right. General traffic rule: left lane = passing lane. :)