Today, some of Reno’s largest hotel casinos are located miles from the city center. But they were once confined to a much smaller area, as Alicia Barber explains in this episode of “Time & Place.” Unlike Las Vegas, Reno never had a strip, a part of town made up entirely of casinos. But it did have the “red line,” a virtual border that surrounded a four-block area just south of the railroad tracks. Only casinos inside the line could offer an unlimited number of slot machines and table games.