Diedre Johnson The Amazon original series “The Underground Railroad” centers around Cora, a young Black woman fighting to escape slavery. When Cora leaves, she encounters a fantastical vision of mid-19th century America, where the underground railroad is a real train running from state to state through tunnels — and each “station” brings its own promise and peril.Cora carries a burden: As a young girl, she was abandoned by her mother, who escaped and vanished.