I was curious about the bat out of hell speed I'm seeing here, so I did an analysis of the sound. The horn changes from 943 to 787 Hz, so assuming the temperature is about 80F this implies a speed of 77 mph along an axis from the train to the camera. Adjusting for the angle, it's probably a little more like 78-79 mph.I fucking love the internet.
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posted by Mister_A at 11:05 AM on June 24, 2011 [3 favorites]