The Department of Transportation said a train was stalled between Terminals B and C around 3:15 p.m. That caused train traffic to be shut down in both directions.
Buses were rushed in to replace the trains while crews worked to get the service running again.
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Service resumed at about 5:30 p.m.
Reports from passengers started hitting social media just before 3 p.m. Many have been stuck at the station for more than an hour.
One passenger said there are hundreds of people waiting:
Port Authority police said that about 4 p.m., the Airtrain was evacuated without incident. The AirTrain will be out of service until further notice, and bus operations will be utilized in the mean time.
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Here are some posts from people who are stranded: