Guide bar
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View of a track from a sandpile bumper post, in the Montreal Metro near the Beaugrand Station, showing the cross-section of guide bars, precast concrete roll ways and conventional track
The rubber-tyred metro systems that incorporate 1,435 mm (4 ft 8 1⁄2 in) standard gauge track have angle irons as guide bars, or guiding bars, along the roll ways. The Busan Subway Line 4, that lacks a rail track, has I-beams installed with the flanges being vertical. The Sapporo Municipal Subway, that lacks a rail track as well, has none.
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