Chapter 1 | The Race Underground | American Experience | PBS

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.

Learn more about THE RACE UNDERGROUND, including where to watch the full documentary: http://www.pbs.org/wgbh/americanexperience/films/race-underground/