Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Transport in France relies on one of the densest and most efficient networks in the world with 146 km of road and 6.2 km of rail lines per 100 km2. It is built as a web with Paris at its center. France is currently one of the world leaders in railway technology and is also in the forefront of modern tramway developments. There is a total of 31,939 kilometres of railway in France, mostly operated by SNCF, the French national railway company. However, the railway system is a small portion of total travel, accounting for less than 10% of passenger travel.