The transit line turned into the Wild West as the bull ran free while commuters waited for their trains.
The first reports came in around 10:30 a.m. at Newark Penn Station.
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Authorities eventually corralled the nearly 800-pound animal near Newark Liberty International Airport.
He was tranquilized and taken to "Skylands Animal Sanctuary and Rescue."
Skylands founder named the bull "Ricardo."
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No injuries were reported throughout the incident.
NJ Transit said there were delays of up to 45 minutes between Newark Penn Station and Penn Station New York due to the police activity.