In 1850 , it was extended to South Milton , and in 1855 it was extended to Union .
On February 28 , 1849 , the first segment from Great Falls ( now Somersworth ) to Rochester was opened .
In 1850 , Great Falls was extended to South Milton , and in 1855 Great Falls was extended to Union .
On February 28 , 1849 , the first segment from Great Falls ( now Somersworth ) to Rochester was opened .