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Well, the mom almost did jump onto the tracks -- she would have been grievously injured for sure.
In Chicago the UP (fmr. Chicago & Northwestern) Metra trains run "backwards", i.e. on the left, where there are double tracks. I knew this but since there are other railroads on which Metra runs commuter service and I had at times used them I got myself confused about which railroad I was on and which way to be facing. I heard the rumble of a train going express but I thought it was obscured by a stairway structure and so I leaned out to check for it.
It was behind me, and it was only the air pressure around the engine that blew me back enough so I wasn't actually hit. Inches, I swear. Dumbass.