One person suffered a serious injury, two suffered moderate injuries, and the rest suffered minor injuries.
Amtrak says service has been restored between Philadelphia and New York after a GPS server issue halted trains Friday morning.
A bull on the loose was spotted running on the New Jersey Transit train tracks in Newark on Thursday morning before it was safely captured.
Trains began being impacted by the fires around 2:45 p.m., just before the start of the evening rush.
A series of electrical problems has caused delays and service suspensions for trains on the northeast corridor through New York.
Republican New Jersey Gov. Chris Christie says he'd "smack" Democratic New York Gov. Andrew Cuomo for predicting a "summer of hell" as part of track repairs at the nation's busiest rail station.