By William Crum Staff Writer wcrum@oklahoman.comContractors will bid soon on building the downtown streetcar line, one of the single biggest MAPS 3 construction projects. Construction of the 4.6-mile main line and 2.3-mile Bricktown loop is estimated to cost $57.2 million. "We are right on budget," consultant Mark Dorn told a MAPS 3 advisory subcommittee this week. Including six streetcars and a maintenance shop, the streetcar system is expected to cost $131 million. Installation of the rails is expected to begin in November and take nearly two years. Preparations have begun to coordinate business activities and special events with the construction schedule as work proceeds. The streetcar's main line will link Midtown and Bricktown, passing through the Central Business District. Stops will serve St.Read more on NewsOK.com