Which gets me to an idea whose time has come: The Westside Greenway, a proposal to turn the whole corridor into a green, people-friendly park connecting West Baltimore and its neighborhoods with downtown. Think of New York City’s Highline, or Citygarden in St. Louis. Imagine a 1.2-mile corridor of green, with bike lanes and promenades, space for pickup basketball and soccer games, fields for youth sports, dog runs and sculpture gardens. Imagine some of the massive concrete walls set aside for mural artists and rock-climbers. Imagine a series of stairs and elevators connecting Mulberry and Franklin Street, and all the cross streets, with the new park below.