South Acton is an MBTA Commuter Rail station in Acton, Massachusetts. It serves the Fitchburg Line. It is located off Route 27 near Route 2 in the South Acton area. It is the busiest station on the Fitchburg line, averaging 991 weekday boardings. It serves as a park and ride station for Acton and other suburbs of Boston, with a 287-space parking lot owned by the town. There has been a station on the Fitchburg mainline at the South Acton site since 1844; until 1958 it also served a branch line to Maynard which in earlier years had extended through Hudson to Marlborough. This unused right-of-way became the Assabet River Rail Trail. South Acton has had continuous Boston commuter service since its inception except for five months in 1965 during the transition from fully private railroad operations to state subsidy. As part of a $277 million project upgrading the Fitchburg Line, South Acton station has been completely rebuilt with two handicapped-accessible high-level platforms connected with an overhead pedestrian bridge, as well as a drop-off lane off Maple Street. The work began in 2012 and the new station opened on December 19, 2015. History B&M era The Fitchburg Railroad began serving the town with a stop, located off of School Street east of Main Street, when it reached the town on October 1, 1844. The railroad completed the first station in 1845 and, when the new station was built in 1892, the old station was moved to Jones Farm and used as a fire station until 1927. The station was reduced to a single agent in 1932. The building was used as a plumbing and electrical supply store by 1962, though tickets were still sold at the store. The Boston and Maine Railroad sold the building in the early 1970s; it burned in 1984 and was torn down. South Acton served as a station stop for both the Fitchburg Branch and Marlborough Branch of the B&M. The Marlborough Branch split off from the Fitchburg Railroad west of the station. The station also maintained a two-stall round house, a freight house, and a turntable, located off the Marlborough Branch. Marlborough Branch passenger service ended in 1939, though freight service continued on the line until around 1970. The stub of the branch at South Acton was used as a siding to turn RDC trains until its abandonment in 1979. The right-of-way has since