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Do escalators not come with a ratcheting mechanism to prevent exactly that from happening? Seems to me like a serious design error if not..

I guess they were designed to run in both directions, meaning you can't mechanically lock the "down" direction.

I mean, it's probably a Chinese escalator. We didn't get the term "Shenzhen Quality" out of thin air.

That seems a bit of a misnomer when everything is made in Shenzen.

Funny, it seems increasingly apt to me.

Most escalators used outside of China are not made in Shenzhen.