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Speed calculations:
OG Acela trainset = 663 feet
150 mph = 220 feet per second
663 / 220 = ~3 seconds
Therefore, if the Acela trainset passes a fixed point in the frame in 3 seconds, it is traveling at around 150 mph. At 135 mph, it takes the same trainset 3.3 seconds to pass a fixed point.
Full Princeton Junction video: • 12 Hours Of High Speed...