The oldest continuously operating street railway system in the world is located in which U.S. city?

Streetcars in New Orleans, Louisiana have been an integral part of that city's public transportation network since the first half of the 19th century. The longest of New Orleans' streetcar lines, the St. Charles Avenue line, is the oldest continuously operating street railway system in the world.

Today, New Orleans is noted in media reports for its historic streetcars and streetcar lines. On Carrollton Street in New Orleans, there is a historic marker that says that the Carrollton Street Car line in the oldest continuous streetcar line in the U.S. This is true; but, the Cable Car in San Francisco and the Trolley in New York both predate the New Orleans system by a few years. Nevertheless, New Orleans can claim that it was the second city in the nation to have a street car system and that it has the "oldest continuously operated line" in the world with the St. Charles and Carrollton line.