No, it’s not a variation of the escalator temporarily stairs joke.
Getting out of the Line 4 subway Tuesday morning, I noticed one of the exits had been sealed off (the one I would have taken), and outside there were a good number of police cars, lights still flashing. I was on my way to meet some friends for lunch near the Beijing Zoo, and I considered snapping a shot of the sealed off exit from outside. There was already one guy with a pro camera taking pictures. While I was curious what happened, I didn’t really think much of it.
Then this morning, while reading a random news article, I was led to this story in the “more stories” section. It turns out, just ninety minutes earlier that Tuesday, the Line 4 Beijing Zoo Exit A escalator went haywire, reversed direction, and well…you can read and look at the rest.