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Why do some of the Paris metro trains have rubber wheels?

Asked by andrew (16201points) July 5th, 2009 from IM

Some (not all) of the metro trains have what look like truck tires instead of the normal train-like train wheels (metal on metal). The rubber wheels definitely cut down on noise when making turns, but what other reason is there for having a voiturement wheel in such a trainment place?

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