PHILADELPHIA (CBS) – A signal problem is causing several Center City trolley routes to be diverted Saturday afternoon, according to SEPTA.

Trolley Routes 11, 13, 34 and 36 are being diverted to bus service between 40th and Market streets or transfer to the Market Frankford Line due to a signal problem at 37th Street.

Route 10 trolleys will continue to operate in the tunnel.

Stay with CBSPhilly for updates.

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