The Framingham/Worcester Line of the MBTA Commuter Rail system runs west from Boston, Massachusetts, to Worcester, Massachusetts, through the MetroWest region, serving 18 station stops in Boston, Newton, Wellesley, Natick, Framingham, Ashland, Southborough, Westborough, Grafton, and Worcester.

In 1975 the line was cut back to Framingham, but service returned to Worcester in 1994 with four infill stations added between 2000 and 2002.

After purchasing the Framingham–Worcester trackage from CSX in 2012, the MBTA has begun adding service to the outer section of the line and performing track work to increase speeds and reliability.

The Massachusetts Turnpike Authority acquired the tracks from Newton to Back Bay station[4] in order to construct the Boston Extension of the Massachusetts Turnpike from the Route 128 circumferential highway to the then-elevated Central Artery in downtown Boston.

When Amtrak started operations on May 1, 1971, no intercity service was kept on the line, thus ending direct connections from Boston to Springfield, Pittsfield, and Albany.

Boston-New Haven (Inland Route) service was restored under the Bay State name in 1984, and ran in various forms until the early 2000s.

Service along the remaining Boston-Framingham segment was considerably increased in October 1979; this was intended to partially compensate for the closure of the Needham Line that month to make room for Southwest Corridor construction.

CSX then dispatched (controlled signals) on the line from their operations base in Selkirk, New York, resulting in low priority for passenger trains.

[8] Conflicts with freight trains, ongoing track work, and an increase of passenger load of about 40% since opening were all blamed for the poor on-time performance, as were new federal speed regulations that went into effect in 2005.

[9] In 2007, pessimistic that CSX would ever sell the line, the state Executive Office of Transportation began studying alternatives to improve service.

Other parts of the agreement included plans for double-stack freights west of Worcester and the abandonment of Beacon Park Yard.

[22] The ultimate goal was originally for 20 Worcester round trips by October 2013, up from 12.5 round trips before the service increases; however this was pushed back by delays in the rebuilding of Yawkey station and the delivery of the new MPI HSP46 locomotives and bilevel passenger cars.

[23] By early 2013, Beacon Park was largely vacated except for the locomotive maintenance facility, leaving only occasional freight service east of Framingham.

Blanket heat-related speed restrictions were intended to be eliminated, limiting delays even on hotter summer days.

In November 2013, MassDOT announced plans to spend $15 million through 2014 and 2015 to improve travel times on the line.

[33] On May 23, 2016, the MBTA began running a single daily round trip – inbound in the morning rush, outbound in the late evening – with no intermediate stops between Yawkey (later renamed to Lansdowne) and Worcester.

[47][48] Midday service was temporarily reduced from May 2 to October 17, 2022; July 10 to September 11, 2023; and November 18, 2024, to January 6, 2025, to accommodate the construction projects.

[52] As of August 2024[update], the MBTA intends to run Framingham–Boston locals and Worcester–Boston zone expresses, with both services on 30-minute headways, by 2026.

[55][56] Design work for the Newton stations was paused at 75% completion in September 2023 because project costs had risen to $255 million.