Did a real superficial scan of that. Found this - there is undoubtedly more.
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Passenger Rail Projects, CSX A-Line Halifax Northampton P-5741 R171422.
DESCRIPTION: Construct New Main Track A80.7-A82.4, including rehabilitation of CSX SA-Line bridge over Roanoke River.
New connection btwn A-Line & SA-Line at MP A-80.7. Reconstruct main track btwn MP A-82.4 and MP A-84.7. Create Second Main.
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Thought that was interesting. Will look further through that document when I have time.