research question: why are nyc subway floors slippery in the winter?

I can’t find any good research on this — why are the floors in all subway stations slippery in the winter?

I’m fairly certain that it’s not people tracking water in, because every portion of the floor in every station is slightly damp — if people were tracking the moisture in, I’d expect to see uneven distribution based on where people walk — as well as dry patches. Instead, the dampness is evenly distributed everywhere.

Part of me suspects some atmospheric phenomenon — the stations are underground, and they are warm. Maybe the conditions are right to induce continual condensation?

Leave a Reply