In the late 19th century, as America's teeming cities grew increasingly congested, the time had come to replace the nostalgic horse-drawn trolleys with a faster, cleaner, safer, and more efficient form of transportation. Ultimately, it was Boston — a city of so many firsts — that overcame a litany of engineering challenges, the greed-driven interests of businessmen, and the great fears of its citizenry to construct America's first subway. Based in part on Doug Most's acclaimed book of the same name, The Race Underground tells the dramatic story of an invention that changed the lives of millions.