The fire department says one passenger was treated for a minor injury to her leg.
The collision took place about 9 a.m. at an intersection, at Martin Luther King Junior Way and South Holly.
KOMO-TV reported the train had to be taken out of service because of major damage to the front.
Sound Transit says normal light rail service was restored by Friday afternoon.
Buses ran between the Mount Baker Station and the Rainier Beach Station while light rail service was interrupted.
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