Back Bay is an intercity rail, commuter rail, and rapid transit train station located just south of Copley Square in the Back Bay and South End neighborhoods of Boston, Massachusetts. The present building, designed by Kallmann McKinnell & Wood, opened in 1987. It replaced the New Haven Railroad's older Back Bay station - which opened in 1928 as a replacement for an 1899-built station - as well as the New York Central's Huntington Avenue and Trinity Place stations which had been demolished in 1964.Although South Station is Boston's primary southside rail hub, Back Bay maintains high traffic levels due to its location in the Back Bay near the Prudential Center development and its access to important Northeast Corridor services. All Amtrak Acela Express and Northeast Regional trains running to and from South Station stop at Back Bay, as does the daily Lake Shore Limited long-distance train. Four MBTA Commuter Rail routes - the Providence/Stoughton Line, Franklin Line, Needham Line, and Framingham/Worcester Line - also stop at Back Bay, as do the Orange Line subway and several local MBTA Bus routes. It is the third-busiest MBTA Commuter Rail station (after North Station and South Station) and the fifth-busiest MBTA subway station.