Hanging out underneath train tracks likely isnât your idea of a pleasant afternoon. But in the case of Miami s new Underlineâa 10-mile, 120-acre park and urban trailâitâs about to become the place to be. The first phase of the project, a half-mile stretch known as âBrickell Backyard,â is now open to the public after seven years of planning and construction. Set directly below the above-ground Miami Metrorail system, The Underline is a testament to the power of creative urban development. It will serve up outdoor recreation for visitors and locals; it will showcase public art; and perhaps most unexpectedlyâyet apt, given its locationâit will offer a transportation benefit, too. âA lot of people donât think about this as a transportation solution, but connecting walking, biking, jogging, and more to transit is probably the lowest hanging fruit for reducing our obedience to the car,â says Meg Daly, CEO and President of Friends of The Underline, the non-profit organization that has overseen the project.