Five Long Island Rail Road workers schemed with each other to pocket massive amounts of overtime “by repeatedly covering for one another’s absences from work,” federal prosecutors alleged Thursday.

The latest outrage in the OT scam uncovered by MTA Inspector General Carolyn Pokorny last year was revealed in a Manhattan federal court indictment that charged the defendants with conspiracy to defraud the United States and federal program fraud.

The new filing also added a fifth defendant — Frank Pizzonia — to the ring of four alleged fraudsters who were busted in December for taking advantage of what Pokorny has called an “honor system” for reporting hours.

The men “worked together to fraudulently claim pay for hours they did not work by, among other things, repeatedly covering for one another’s absences from work while nonetheless understanding that time sheets including the unworked hours would be submitted,” court papers say.

Pizzonia was arrested Thursday morning and hauled into Manhattan federal court, where he was released on a $100,000 bond pending arraignment Wednesday with his co-defendants, courthouse sources said.

Thomas Caputo, Joseph Ruzzo, John Nugent and Joseph Balestra were all among the MTA’s top earners during the alleged scam, with Caputo raking in $461,000 in total wages during 2018.

Also Thursday, a separate indictment was unsealed against Michael Gundersen, who was also busted in December for allegedly scamming overtime as a subway maintenance supervisor for the New York City Transit Authority.