what happaned to Mohigan burial mounds in castleton new york 12033

While away I recieved an e-mail inquiry as to what happaned to the burial mounds located in 12033. My researches including old Castletonian news articles make clear that in the 19th century , the railroads were being built. There was a need for fill for the railbeds especially along the Hudson River route. The mounds were dug into rediscovered and used to fill the railbeds. These sort of situations were not uncommon back then. Many burial mounds were distroyed in the process of building , farming etc. A shame , of course......lost to history and culture.