While most subway systems like the London Underground and the one in New York City use steel wheels, a few metro / subway systems in the world use rubber tires. Some examples include the Paris metro, Montreal metro and the Mexico City metro.
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Sources:
Steel reduces 85-99% of friction statistic - [ Ссылка ]
^^^ This source may not be reliable because they actually build steel rails.
Diagram of the track - [ Ссылка ]
McGill Uni. article (Great read) - [ Ссылка ]
Song: Great Day by Madvillain (Hopefully no copyright blocking issues)
#metro #railway #railfans
