The Real Housewives of Atlanta princess Porsha Stewart apparently slept through every history class, just recently learning that trains were not actually involved in the Underground Railroad — and Breaking Celebrity News has it all caught on video.

In a preview for Sunday’s episode, the housewives visit several historical landmarks, including one of the safe houses used by 19th-century black slaves in the United States to escape to free states.

Their tour guide explains that they still to this day don’t know how they got in or out, to which Stewart states: “Well, there has to be an opening for the railroad at some point because somebody is driving the train.”

The tour guide chuckles but quickly realizes that Kordell Stewart ‘s ex-wife isn’t joking.

“It wasn’t a train, baby,” Phaedra Parks explains. “That’s just a euphemism.”

Kenya Moore is disgusted by Stewart's naivety.