Ravell Call, Deseret News
FILE - A TRAX train carries passengers on Main Street in Salt Lake City on Tuesday, Jan. 23, 2018.

SALT LAKE CITY — TRAX commuters faced significant delays Wednesday after sparks and an explosion shut down lines overnight.

Utah Transit Authority officials said a catenary wire that carries power and runs above the trains fell onto a southbound train at 390 S. Main late Tuesday in downtown Salt Lake City.

That power surge caused an explosion on the train, which was carrying about 30 people. One person suffered a wrist injury and was taken to a hospital, according to UTA.

Hayden Smith, who was on the train at the time, said panic ensued after the explosion.

"I heard a pretty big boom and a lot of screaming, so I took my headphones off and turned around, and there were quite a few sparks from outside of the car," Smith said.

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"One guy was trying to kick the window down. … Like he cracked it pretty bad, trying to open it."

Wednesday afternoon, UTA officials said the cause of the incident was still under investigation.

"UTA's repair and maintenance crews have assessed the damage and are working around the clock to restore service," the agency said in a news release.

TRAX riders will continue to face delays as crews repair the line. UTA said bus bridges will remain in place while repair work continues through at least Thursday evening.

— Payton Davis, Shara Park, Mike Anderson