Hearing

It's difficult to find a metaphor for something you can't describe in actuality. There is a sustained high pitched sound, like a recording of the ocean played back at the wrong speed.
I hear the train long before I see it as I approach the platform. Today is pretty nice and clear, so I heard it the moment I stepped from my car.
Gave me about 30 seconds to run probably 100 yards.
Oof.