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This might be totally of topic but here goes. Soemone asked why do signals blink.. it changes the entire aspect of that signal for example: a Yellow signal means "Clear to Stop" ie. Expect teh enxt signal to be REd. A blinking Yellow means "Advance Approach" Proceed prepared to stop at SECOND signal. Trains Exceeding 45 mphs must reduce by 10 MPH before passing next signal (hence assumingand expecting the next signal will be a "straight-up" yellow. (No need to slow up by 10 MPH if the next signal displays Clear, Approach Diverging or Advance approach. although i have never seen a blinking signal.. thats what it means ( UP here) if this is even on topic! Kev.
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