LIRR and NJ Transit riders will face as many as 44 days — mostly during the work week — of limited service this summer while Amtrak works to fix antiquated infrastructure at Penn Station, it was revealed today.

The limited service would run from July 7 to July 25 and from Aug. 4 to Aug. 28, according to New Jersey state legislators who saw the plans Tuesday. The work would mostly take place during weekdays, with no relief for rush hours.

“The utter disregard for commuters from Amtrak just continues, and it’s unacceptable,” said New Jersey Assemblyman John McKeon (D-Essex/Morris). “Amtrak ought to listen to the many frustrated rail passengers in New Jersey and arrange for repairs to have the least possible effect on commuters.”

Amtrak confirmed that it is working on a plan and talking to the MTA and NJ Transit about their service scheduled during the repairs.

“Our commuter partners are currently reviewing the initial plan and developing individual service plans. We will reconvene with both partners on Thursday for further development,” Amtrak said in a statement Tuesday. “All groups are working with the common goal of creating service schedules that minimize impact on the traveling public when we do the necessary upgrades to Penn Station.”

NJ Transit Executive Director Steven Santoro warned last week that the agency might lose more than half their trains on some weekdays, dropping the number of NJ Transit trains from 63 during morning rush hours to 30 or even just 25 on some days.

“If their proposal is the only or the best one and it results in us only able to run holiday service, we are going to have a concern in regards to overcrowding,” he said when speaking to the New Jersey Legislature last week.

There have been two derailments at Penn Station in the past five weeks that have severely disrupted train traffic into the hub — especially for LIRR and NJ Transit customers.

The more recent, on April 3, caused an entire week of delays and cancellations as Amtrak scrambled to replace aging timber and damaged switches.

After the derailments, Amtrak officials said the aging infrastructure at Penn Station needed a complete overhaul.

MTA officials said they are still working out the details with Amtrak.

“We’re in discussions with Amtrak and will continue to meet with them to ensure our riders’ best interests are represented,” said spokeswoman Beth DeFalco.

NJ Transit officials didn’t immediately return calls for comment.