The Knox and Lincoln Railroad commenced service to Rockland in 1871 using a ferry to cross the Kennebec River between Bath and Woolwich.
Maine Central purchased the Samoset destination hotel in nearby Glen Cove (a part of neighbouring Rockport) in 1912, and offered direct passenger service for summer visitors from the large eastern cities.
[4] In 2019, Canadian Pacific Railway agreed to purchase the Central Maine and Quebec, thereby inheriting the operation of the Rockland Branch.
[6] In 2021 Finger Lakes Railway (FGLK) subsidiary Midcoast Railservice (MCRI) took over operations of this line.
This is due to the closure of their main customer, Dragon Cement, closed their plant on the line.