Actually a pretty good technique if you get pushed on to the tracks by one of the 11,000 loonies that the ACLU insists have the right to be on the streets.
In DC there is room under the platforms for someone who falls or is pushed. That is if they have time to get under there.
I remember once a lady was drunk and fell under the train. We went under to look for her expecting to find blood and guts everywhere, as we crawled under the train we looked and here she came crawling toward us. The train had passed over her without touching her.