[tomatocracy]

Not sure but I think I read a while ago that they were removed due to unreliability (it's a while since I've been there myself).

It was very clever how they did the acceleration/deceleration - the "tiles" of the walkway fit together in such a way that each could slide on top of the next one, and at the two ends the tiles would gradually slide closer together (decelerating) or further apart (accelerating).

[tensor]

They were still there pretty recently when I was there. All escalators are a pain for maintenance though. Sure it's cheaper to force people to walk but that's not the point.