Why are there five signals for four tracks? Does the right track have two signals?
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It's an optical illusion of sorts. The outer tracks are only signaled in one direction with the center tracks being bi-directional. All signals are offset to the right of the track to which they apply. With that being said, from right to left you're seeing the front of the signals for tracks 1, 2 and 3 and the back of the signals for tracks 3 and 4. The westbound signal for track 2 is hidden behind the eastbound track 3 signal (the one with the "288" plate on it). The Acela is on track 3 here.
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