WASHINGTON – The nearly 100-year-old Thames River Bridge between New London, Conn., and Groton, Conn., will undergo a $76 million replacement of its aging bascule lift span under a construction contract between Amtrak and Pittsfield, Maine-based Cianbro Corp., the parties announced. The construction project will take two years to complete and is the largest single capital improvement Amtrak will make to the Northeast Corridor during this time. Work on the project begins this month on the installation of seven new underwater communications and signal submarine cables. In the most dramatic phase of the construction project to occur over 12 days