Green Line D branch  The D branch of the Massachusetts Bay Transportation Authority's Green Line, also known as the Highland branch or the Riverside Line, is a light rail line in west Boston, Massachusetts, with stations also located in Brookline and Newton. It branches off near Kenmore Square from the Tremont Street and Boylston Street subways from downtown shared with the other light rail lines. It then continues west for about ten miles on a private surface right of way, formerly the Highland branch of the Boston and Albany Railroad. The right of way is double tracked throughout without express tracks. It is grade separated from roads and highways, though there are pedestrian crossings at stations and in Webster Conservation Area in Newton.  , the downtown terminus is at Government Center. Free transfer is provided to the rapid transit lines and other light rail lines (the B branch to Boston College, the C branch to Cleveland Circle, and the E branch to Heath Street) at the various subway stops. The D branch was the most recent light rail line to be built in the Boston area, opening in 1959. It was built on the Boston and Albany Railroad's Highland branch, which closed in 1958 for the conversion. The route has varied scenery, passing golf courses, residential neighborhoods, woods, lakes, and small town centers. The Newton Centre and Newton Highlands stations still feature Richardsonian Romanesque station buildings designed by Shepley, Rutan and Coolidge in the 1890s. The first section of what became the Highland branch was built by the Boston and Worcester Railroad between Boston and Brookline in 1847. The Charles River branch railroad, a forerunner of the New York and New England Railroad, extended the line to Newton Upper Falls in 1852. The B&A, successor to the Boston and Worcester, bought the line in 1883 and extended to Riverside, rejoining its main line there. The B&A instituted loop service ("Newton Circuit"), going one way to Riverside on the main line and the other way on the Highland branch; the NY&NE continued to use the branch as well. In 1906 the New York, New Haven and Hartford Railroad built a new cutoff from Needham Junction east to their Dedham branch at West Roxbury, and began routing NY&NE trains that way. However, in 1911, they too began running loop service on the "Needham Circuit", running one way on the old Boston and Providence Railroad to West Roxbury and the other way on the B&A Highland branch. NYNH&H service through Newton stopped in 1925 and the last B&A train ran over the Highland branch on May 31, 1958.