This picture, which appears in Byrne Fone's book Historic Hudson: An Architectural Portrait, shows the elevated railroad track going east and west through the South Bay. This is the railroad that ultimately became what is known today as the "causeway." The groundbreaking for this railroad on piles took place in 1874, but it wasn't completed until 1889. Unfortunately, the elevated track was not a success. The South Bay apparently has a "bad bottom" that could not support the trestle, so it was very soon filled in.