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Guide bars, orguiding bars[1] arerubber-tyred metro systems that incorporate1,435 mm (4 ft 8+1⁄2 in)standard gaugetrack. They haveangle irons as outside of the tworoll ways.
TheBusan Subway Line 4 lacks arail track, and hasI-beams installed as guide bars.
Theflanges are vertical. TheSapporo Municipal Subway, that lacks a rail track as well, has no guide bars. It has acentral guide rail instead. Guide bars are also used to provide guidance forguided buses.
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