Four defendants in the so-called "Underground Railroad" MARTA fraud scheme are due in court Monday in DeKalb County.

Robert Clark, Christina Carney, Stephanie Finger and Jedadia Byrd will stand for a reading of the charges, according to the district attorney's office. If they don't plead guilty, they'll head to trial soon.

The elaborate scheme is said to have taken place in 2013, when MARTA computers were hacked. Authorities believe $1 Breeze fare cards were purchased and fraudulently loaded with much higher values.

The defendants then sold the cards at a discount to riders, pocketing the difference, authorities have said.

Defendant Michael Dallas pleaded guilty in 2015 to racketeering and agreed to serve two years in prison with credit for the time he'd already served. He was described as a low-level player in the massive scheme.

Distributors were allegedly stationed selling the cards at various MARTA terminals, including H.E. Holmes, Five Points, Chamblee and Doraville.

The four defendants are going before Judge Mark Anthony Scott in courtroom 6A, Clark at 8:30 a.m., the others at 1 p.m.

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