What is already arguably America's worst public transit project is about to get a whole lot more expensive. The Metropolitan Atlanta Rapid Transit Authority (MARTA) is moving ahead with plans to build a 2-mile extension to the city's 2.7-mile streetcar line, with an estimated price tag of $230 million. The Center Square reports that the first batch of that new spending—an $11.5 million contract awarded to a firm that will design the extension—was doled out last week. The project is being funded by a half-cent increase in the Atlanta sales tax, and the extension is scheduled to open in 2028....