[Answer] Despite being known as "The Underground," what city's public transit system is only 45% underground?

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Despite being known as "The Underground," what city's public transit system is only 45% underground?

• London:The London Underground (also known simply as the Underground) is a rapid transit system that services the London metropolitan area. Known by locals as "The Tube," it is by far the most common mode of transportation in London. The history of the Underground began in the 19th century with the construction of the Metropolitan Railway, the world's first underground railway. Today, the entire Underground network serves 272 stations, and handles up to five million passenger journeys a day. Despite its name, only 45% of the system is underground, with the majority of the network in London's outskirts operating on the surface.

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