The Highland branch, also known as the Newton Highlands branch, was a suburban railway line in Boston, Massachusetts. It was opened by the Boston and Albany Railroad in 1886 to serve the growing community of Newton, Massachusetts. The line was closed in 1958 and sold to the Metropolitan Transit Authority (MTA), the predecessor of the current Massachusetts Bay Transportation Authority (MBTA), which reopened it in 1959 as a light rail line, now known as the D branch of the Green Line.

The Boston and Albany Railroad was a railroad connecting Boston, Massachusetts to Albany, New York, later becoming part of the New York Central Railroad system, Conrail, and CSX Transportation. The line is currently used by CSX for freight. Passenger service is provided on the line by Amtrak, as part of their Lake Shore Limited service, and by the MBTA Commuter Rail system, which owns the section east of Worcester and operates it as its Framingham/Worcester Line.