[3] Service to Bellingham Junction was briefly restored in March 1940 with a single daily round trip between Boston and Franklin via the Charles River Branch, but this was cut back to Caryville station in North Bellingham in May 1940; at the same time, however, additional service was added between Boston and West Medway.

[2][3] By the time the Massachusetts Bay Transportation Authority (MBTA) was founded in August 1964 to subsidize suburban commuter rail service, the West Medway Branch was moribund.

[2] The sole remaining round trips to Millis and Dedham were cut on April 21, 1967, due to extremely poor ridership.

A 6-mile section of the branch from Needham Junction to Ice House Road in Medfield is planned to be converted into a compacted stone dust multi-use path as a portion of the 7-mile Bay Colony Rail Trail project.

The line sees occasional freight use from Medfield Junction into Millis, operated by the Massachusetts Coastal Railroad.