Gold Line

Construction crews prepare a huge rebar column as they work on the Gold Line extension over the 1st Street Bridge. Los Angeles city crews are in the process of widening the historic bridge to allow two lanes of traffic on both side sof the tracks. (Bob Chamberlin / Los Angeles Times)

Sept. 16, 2014 4:59 AM PT

A construction crew aligns track near the Atlantic Boulevard Station as part of the Gold Line light rail extension project. (Bob Chamberlin / Los Angeles Times)

Construction crews hoist a huge rebar column as they work on the Gold Line extension over the First Street Bridge. (Bob Chamberlin / Los Angeles Times)

A Gold Line construction crew member walks through a tunnel near Mariachi Plaza. (Bob Chamberlin / Los Angeles Times)

Pile driver foreman Supervisor Dave Corley, right, and pile driver Pedro Correa work on a drill hose as they prepare to drive steel tubes into the earth for a new foundation for the 1st Street Bridge as part of the Gold Line project. (Bob Chamberlin / Los Angeles Times)

Workers walk from East L.A. toward downtown on the 1st Street Bridge. City crews are widening the historic bridge so two lanes of traffic can run on both sides of the Gold Line tracks. (Bob Chamberlin / Los Angeles Times)

A giant arch sits on North Santa Fe Avenue after it was removed from the 1st Street Bridge, above the pedestrian in the background at left. (Bob Chamberlin / Los Angeles Times)