By 1900 the horse-drawn cars had all been replaced with electric ones, and by 1930 the system had expanded to include 90 miles of track and 183 cars. At the same time, competition from buses caused many of the coastal and suburban routes to close. By 1939 only 4 lines remained operational, with a few more brought back during World War II. After the war the streetcars were replaced by trolleybuses, with the last streetcar making its final run in 1953.
Here's another view that doesn't show the streetcar, but shows that you could connect to trains at the Nice train station.
In 2007, Nice introduced a new and very sleek streetcar system. They're very unusual and beautiful cars in my opinion. Originally the system was intended to operate with a ground-level third rail, but they instead opted for the conventional overhead wires, perhaps due to cost. Although there is currently only one line on this new system, there has been discussion about adding a line from the city to the airport.
This photo is courtesy of Myrabella