SEPTA trolley service was briefly disrupted in Center City this morning.

The transit agency said trolleys on routes 10, 11, 13, 34 and 36 weren't operating through the Center City tunnel due to signal problems for about half an hour.

Normal service had resumed by about 8:45 a.m., though some residual delays were expected.

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Contact the Breaking News Desk at 215-854-2443 or Follow @phillynews on Twitter.