The intricate series of escalators goes in the downwards direction in the morning, following the flow of humans heading to work. After 10 am, the escalators reverse direction and start taking passengers up the slopes. This is ideal for daily usage, but quite tiresome for a tourist who happily rides the escalator for the the 20-25 minutes that it takes to reach the summit, only to realize that he or she will have to trudge all the way back down by foot.
***********
"An escalator can never break: it can only become stairs. You would never see an Escalator Temporarily Out Of Order sign, just Escalator Temporarily Stairs. Sorry for the convenience." - Mitch Hedberg