List of urban rail systems by length

This is a list of the longest underground/surface/elevated subways, metros and rapid transit modules of the world. Not included are Commuter Railways such as the S Lines of Milan, the FM of Rome, the RER of Paris, the Belgian Pre-Metro, the Urban Railways of Australia, the Tramways of England, the funiculars of Genoa and Naples and all other Commuter Lines (including those underground).