Question for the New Yorkers/Engineers. How come the subway platforms are a square piece of concrete instead of having platform with an overhang and a crawl space underneath for this type of situation? It seems like this happens too often with people having close calls with the train. Wouldn't that be a good safety measure to have in place to prevent this type of thing from happening?
Without giving it too much thought, here's what I think. If there was an overhang platform design like you described, the train would create a large pocket of air once it passes by. As the train passes, there will be more and more pressure underneath. Since it is indoors, there is no place for that air to escape, thus causing structural damage to the platform