Question: What was the eastern terminus of the historical railroad that ran 98.77 miles through towns including a Middlesex County town with a 2010 census population of 17659?
Sentence (from "Acton, Massachusetts"): Acton is a suburban town in Middlesex County, Massachusetts, United States, approximately twenty-one miles west-northwest of Boston along Route 2 west of Concord and about ten miles (18 km) southwest of Lowell.
Relevant evidence: No