Especially on the escalators that go down? My guess is that it’s something about different air temperatures but really don’t know
In: 68
The subway trains are pushing air ahead of them when they go through the tube. This air has to go somewhere and there also needs to come in air to replace the pushed out air behind the train. This means that while trains move through the system of tubes air will be pushed out and sucked in at some points which in stations are the entrances and exits with the escalators leading to them.
Of course it also pushes and pulls air through the entire system but if that isn’t the way of least resistance for the air you get these drafts in the stairways/escalators.
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