The term Paris Railway can be summarized as the METRO, a rapid transit system in Paris, France. The METRO is the second busiest METRO system in Europe, after Moscow METRO, and serves over 4 million passengers daily. It consists of 16 lines and 303 stations, making it one of the most extensive METRO systems in the world. The METRO has been in operation since 1900 and is an important part of the public transportation system in Paris.