Quote:
Originally Posted by Elspode
As we rode the train into DC earlier, we could feel the pressure on our eardrums increase as we went through tunnels. It was clear that the trains acted as a piston in these confined spaces, increasing the ambient pressure.
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This is awesome. Most people are totally oblivious to the wind caused by the trains. You're here one day and notice it and describe it perfectly.
It's most pronounced under and near the rivers, because in other locations, they put in vertical shafts to relieve the pressure. It's more efficient when the trains don't have to push a mile of air in front of them to get where they are going.
10-03-2012, 07:32 AM
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