Service between Ayer Jct. and Eastport was abandoned in 1978 and the tracks removed in 1980. The line from near Brewer to St. Croix (near Calais) was abandoned in 1985, but the tracks are still in place and are owned by the state of Maine. There are some proposals to run a tourist train on some of the line and remove the rails on other parts, converting it to a trail. I do not have the exact current details of these proposals.
Dick H