Service to the Morris and Essex line was operating on a 30-minute delay in both directions after the 7:45 a.m. incident west of the Broad Street Station, NJT spokeswoman Lisa Torbic said.
The train left Montclair State University at 7:10 a.m., and was scheduled to arrive in Hoboken at 8 a.m., Torbic said.
New Jersey Transit Police and EMS were on scene.
None of the approximately 20 passengers and crew were on board were injured.
The NJTPD is leading the investigation.
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