The construction of the modern Grand Central Terminal (often called Grand Central Station) in New York City took exactly 10 years, spanning from 1903 to 1913. This was one of the most complex high-value engineering projects of its time because the builders had to completely replace the previous station while keeping the train service running for nearly 100,000 daily passengers. The project involved a massive excavation that lowered the rail yard to 30 feet below street level and the pioneer use of electric traction to eliminate the dangerous steam and soot in the tunnels. The terminal officially opened to the public at 12:01 AM on February 2, 1913. In 2026, it stands as a masterpiece of Beaux-Arts architecture, and its decade-long construction remains a high-value case study in "active-site" management, proving that a major metropolitan hub can be completely rebuilt without ever stopping the rhythm of the city's commuters.