Question: The Escondido Sub formerly served one of the larger railroads in the United States that was chartered in what year?
Sentence (from "Atchison, Topeka and Santa Fe Railway"): The Atchison, Topeka and Santa Fe Railway (reporting mark ATSF) , often referred to as the Santa Fe or AT&SF, was one of the larger railroads in the United States.
Relevant evidence: Yes