The light rail line's first leg from downtown to La Cienega Boulevard opened Saturday and rides are free for the weekend. An additional stop in Culver City opens this summer. Trains are slated to reach Santa Monica by 2016.
The $932 million Expo Line passes Staples Center, USC and Exposition Park.
Compared to original estimates, the project overran costs by more than $200 million and arrives nearly two years late.
Officials hope the train relieves the traffic-clogged west side and those weary of driving on nearby I-10.
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