SEPTA’s Trolley Tunnel Blitz, the annual maintenance project in the trolley tunnel connecting West Philadelphia and Center City that had been scheduled to begin on Friday, July 8, has been postponed, according to SEPTA’s spokesperson Andrew Busch. “It is postponed due to the Regional Rail issue and the related increase in ridership on our other modes,” Busch wrote in an email.

The trolley routes 11, 13, 34 and 36 will continue normal operation through the tunnel until further announcement.

SEPTA lost a third of its regional rail fleet on July 3 when an issue had been detected with Silverliner V commuter rail passenger cars. 120 Silverliner V cars have been taken out of service, causing the remaining trains operate over capacity. Many trains today have been standing-room only.

SEPTA is planning to provide additional information on the Tunnel Blitz this Thursday. They don’t have a rescheduled date at this time.