Pinky Thomas was a former leader of the Railroad.
Pinky Tomas was the leader of the Railroad from 2273 to 2277 following the leadership of the recently deceased Wyatt, whose journal he read in order to identify how the Railroad had failed. During his term of leadership, Pinky kicked Deacon out of Railroad HQ, stating that he "got sick of the lying, face-changing son of a bitch" and saying that "that month he spent as a Ghoul freaked a lot of people out". After being persuaded to step down following the loss of Trinity, Pinky was succeeded by Desdemona and presumably left the the Railroad.
Pinky Thomas is mentioned only in Fallout 4.