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| | Marc Dufour : Rail : Metro : The principle behind the rubber-tired metro |
 | | In fact, only new Métro systems (Lyon, Marseille, Montréal, Mexico, Monterrey) were done using rubber tired trains, as converting existing systems has been proven uneconomic. |
 | | But the time required to convert a line and advances made in suspensions, electric traction control systems and full motorization (powering all the axles of a train) diminished the advantages of a rubber-tired Métro, and Parisian Métro line conversions gave way to newer steel wheel rolling stock. |
 | | When a tire is deflated and the safety wheel contacts the metal rail, the flange goes down very low and mechanically contacts the detection limit switch which, once triggered, sends the alarm signal. |
| www.emdx.org /rail/metro/principeE.html |
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