Guide bar
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Explore on Lably
ToursExplore Lably’s 3D toursThe Busan Subway Line 4 lacks a rail track, and has I-beams installed as guide bars.
The flanges are vertical. The Sapporo Municipal Subway, that lacks a rail track as well, has no guide bars. It has a central guide rail instead. Guide bars are also used to provide guidance for guided buses.

