PATH train delays, which have frustrated commuters since the beginning of June, continued Monday, despite assurances from officials who said one of the causes would be resolved for the beginning of the work week.

Most of Monday morning's delays were blamed on other problems not related to PATH's ongoing installation of Positive Train Control signals and technology. An issue with that work was blamed for last week's problem near Grove Street station, officials said.

"We did experience one PTC generated signal issue after the morning rush, just after 10 a.m., but it was quickly resolved," said Scott Ladd, a PATH spokesman. "We don't anticipate any major issues during the afternoon rush today."

The delays were blamed on a track condition near Grove Street. A passenger also activated an emergency door handle release that stopped the train, and there was an unattended package at 33rd Street, he said.

Those problems led to platform crowding at Newark Penn Station and Journal Square as passengers waited for delayed trains during the heart of the morning rush hour.

PATH officials did not immediately explain the cause of signal problems that caused delays between 7:21 and 9:38 a.m.

The delays happened after a letter of apology from top PATH officials and assurances that a problem requiring train operators to stop trains before Grove Street Station and manually change signal systems, had been fixed.

There’s a line outside the turnstiles in Newark penn station pic.twitter.com/dsa8pgU4fL — Adonis Marrero (@adonismarrero) June 18, 2018

Lines of people backed up from PATH platforms at Penn Station Newark onto NJ Transit and Amtrak platforms. Commuters expressed their frustration on social media about the delays that were supposed to have been resolved.

Larry Higgs may be reached at lhiggs@njadvancemedia.com. Follow him on Twitter @commutinglarry. Find NJ.com on Facebook.