Commuters should expect delays on SEPTA's Trenton and Media/Elwyn lines Friday morning.
Both Regional Rail lines were reporting 30-minute delays.
The Trenton Line delays are due to equipment problems, the transit agency said. Hour-long delays had been reported earlier.
The Media/Elwyn delays are because of switch problems.
Earlier, inbound Lansdale/Doylestown riders were also facing delays but SEPTA said service on that route was running normally by about 7:45 a.m.