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CHICAGO -- Amtrak computers are back online at Chicago's Union Station after an earlier signaling problem.

Metra Alert - Amtrak Computer Signaling Problem Has Been Restored - Extensive Delays Continue - REVISED @ 8:47 a.m. — Metra BNSF (@metraBNSF) February 24, 2017

According to Metra, there are "extensive" delays and trains are slowing entering and exiting Union Station.

Metra tweeted an update Friday morning, "There are 42 trains waiting to get into/out of Union Station. Delays are extensive and trains are slowly starting to enter/exit the station."

There are 42 trains waiting to get into/out of Union Station. Delays are extensive and trains are slowly starting to enter/exit the station. — Metra BNSF (@metraBNSF) February 24, 2017

Just after 6:30 a.m. Friday, no trains were entering or departing from Union Station for an extended period of time due to Amtrak computer signaling problems.

Metra tweeted an alert, saying: "Amtrak Chicago Union Station experiencing computer signaling problems - trains stopped entering and departing station."

Metra Alert - Amtrak Chicago Union Station Experiencing Computer Signaling Problems - Trains Stopped Entering and Departing Station — Metra BNSF (@metraBNSF) February 24, 2017

Amtrak says residual delays should be ironed out, and they expect no problems for the afternoon rush.

The cause of the power outage is under investigation.

This is a developing story. Check back for details.

For the latest info, go to: metrarail.com

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