New York Subway Extension Begins Service

August 13, 1904 marked the opening of a key extension of New York's first subway system by the Interborough Rapid Transit Company, adding stations along the Broadway line. This expansion used innovative electric multiple-unit trains and addressed growing urban congestion in the booming metropolis. Engineers tackled tunneling under busy streets and rivers, setting standards for rapid transit worldwide. The project connected immigrant neighborhoods to commercial districts, accelerating New York's growth as a global city and influencing subway designs in cities like London and Paris.