MBTA Green Line Branch (A Line) service begins.

The horse-drawn line runs from Central Square, Cambridge, through Union Square to Oak Square and is extended to Newton Corner to Watertown Square in approximately 1860. The segment between Harvard Avenue and Oak Square is replaced by electric streetcars on January 13, 1889, from Kenmore Square (then Governor’s Square) to Newton Corner in 1897, and to Watertown Square on October 3, 1914. Due to a shortage of electric trolley cars, while service is maintained on the four other branches of the Green line, it is “temporarily suspended” on the Watertown branch replaced by buses on June 21, 1969, but never restored. The tracks are torn up in 1996.