Metro Gold Line service could be delayed up to one half hour Monday due to downed lines that power its trains, the agency said.

The downed lines are just south of the Del Mar station near Arroyo Parkway and Del Mar Boulevard in Pasadena, Metro spokesman Rick Jager said.

Trains can travel on a single track around the damage and Metro will provide a bus bridge between the Del Mar Station and Union Station in Downtown L.A., Jager said.

It could take most of the morning to make repairs, he said.

Metro did not immediately determine what caused lines to topple.

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