UPDATE 6:32 a.m.: Signal problems are causing delays on Amtrak trains traveling between Philadelphia and Baltimore.
Although Amtrak says signal and switch power has been restored, travelers should expect minor delays of up to 15 minutes for Friday's morning commute.
Amtrak says some trains departing Washington on Friday morning may be canceled because of an unrelated issue, AP reports.
UPDATE 4:32 a.m.: ABC7's Stephen Tschida reports the train just arrived in Philadelphia, over 10 hours after its scheduled arrival time.
Stephen says the train was traveling between 15 and 30 mph because of a power outage on the tracks that left the signals dark.
UPDATE 4:14 a.m.: ABC7's Stephen Tschida reports that Amtrak cleared the downed power line from the track around 2:30 a.m. Friday.
At 3:12 a.m. Stephen reported the train was headed north toward Philadelphia, and trains were moving again in both directions.
According to Amtrak spokesperson Steve Kulm, Train 188 was still in a holding pattern in Perryville as of 1:17 a.m. Friday. Amtrak officials were unclear if the trains was going back to Baltimore.
Meanwhile, Stephen reported that Amtrak wasn't doing a good job of keeping passengers informed.
ABC7's Stephen Tschida reports that an Amtrak train that departed from Union Station was stranded near Perryville, Maryland Thursday night.
At 10:59 p.m. Stephen reported that the train had been forced to head back to Baltimore.
Tschida is on the train and says the train still has heat and power, but he says it's cold.
An Amtrak spokesperson tells ABC7 that an unknown wire has come down across the track and has blocked all Amtrak travel between Baltimore and Wilmington.