When did the first underground portion of the NYC Subway open?
The first underground portion of the New York City Subway opened on October 27, 1904. This subway is one of the oldest public transit systems in the world and it is also one of the most frequently used, as well as one with the most stations with an impressive 472 in operation. The system has operated 24 hours a day, 7 days a week every day of the year throughout most of its history, barring emergencies and disasters. 