At any rate, the Paris mass transit system carries much more passengers than London's. In 2005, London had 971 million Tube, 53 million DLR and 503 million rail passengers. In the same year, Paris had 1,372.7 million Métro passengers, 444.5 million RER passengers on the part of the network run by Paris transport authority RATP, and a further 633 million on the rest or RER and suburban lines run by Transilien, SNCF's Île-de-France rapid transit branch.

I note the central element of the RER network are three long tunnels across the city.

_{*Lunatic*, n.
One whose delusions are out of fashion.}