Streetcars in New Orleans have been an integral part of the 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, the streetcars are operated by the New Orleans Regional Transit Authority (RTA).
There are currently four operating streetcar lines in New Orleans: The St. Charles Avenue Line, the Riverfront Line, the Canal Street Line, and the Loyola Avenue Line. The St. Charles Avenue Line is the only line that has operated continuously throughout New Orleans' streetcar history (though service was interrupted after Hurricane Katrina in August 2005 and resumed only in part in December 2006, as noted below). All other lines were replaced by bus service in the period from the late 1940s to the early 1960s; preservationists were unable to save the streetcars on Canal Street, but were able to convince the city government to protect the St. Charles Avenue Line by granting it historic landmark status. In the later 20th century, trends began to favor rail transit again. A short Riverfront Line started service in 1988, and service returned to Canal Street in 2004, 40 years after it had been shut down.