A train running along the Market-Frankford elevated line struck a transit agency employee inside a tunnel under Center City, and both directions of the city line were shut down temporarily, SEPTA said Monday afternoon.

The worker was struck in the tunnel under 22nd Street sometime before 5 p.m.. No details about the victim were immediately known, the transit agency said in a statement. The worker, who was taken to Hahnemann University Hospital, was working on a trolley tunnel project. Trolleys run parallel to the subway tunnels in that area.

Westbound trains started running again at 5 p.m., about half an hour after the incident.

Shuttle buses remained in operation for all eastbound commuters between 40th and Fifth streets until about 5:15, when trains in both directions began operating again, SEPTA said.

However, commuters going east between 30th and 15th streets must enter trains from the westbound platform because only a single track is open, SEPTA said.