Park Street is a station on the MBTA subway system, located at the intersection of Park Street and Tremont Street under Boston Common in downtown Boston. One of the two oldest stations on the "T", Park Street is the transfer point between the Green and Red Lines, as one of the quartet of "hub stations" on the MBTA subway system. Park Street is the fourth-busiest station in the MBTA network, with an average of 19,836 entries each weekday in 2010.