Sure, it's the land of freeways, but metro Los Angeles is also home to a growing subway system, a future part of which was the location of a sizable ready mix pour. Some 2,100 cubic yards of concrete were recently placed inside the wood forms on the site of the Gold Line. The wood forms will stay in place while the concrete cures and hardens and the rail-deck portion of the $18.6-million bridge will be poured overnight in July.