Guide bar

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,^[1] outside of the two roll ways. The Busan Subway Line 4, that lacks a rail track, 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.

Ouchy M2 station, Showing the angle iron guide bars, the I-beam roll ways and the bumper posts
View of a track from a sandpile, in the Montreal Metro near the Beaugrand Station, showing the inverted L cross-section of the guide bars (the extreme flared ends are a fabricated inverse U), precast concrete roll ways and conventional track

References

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Rail infrastructure
Tracks (history)	Axe ties Ballast Baulk road Breather switch Cant Clip and scotch Date nail Fastening system Fishplate Ladder track Minimum radius Profile Tie/Sleeper Transition curve
Trackwork	Balloon loop Classification yard Headshunt Pocket track Junction Gauntlet track Guide bar Passing loop Track gauge dual gauge Rail track tramway track Rail yard Railway electrification overhead lines third rail ground-level power supply Railway turntable Transfer table (traverser) Roll way Siding refuge siding Switch Track geometry Water crane Water trough Wye
Signalling and safety	Anti-trespass panels Block post Buffer stop Catch points Defect detector Derailer Guard rail Interlocking Level crossing Loading gauge Platform screen doors Railway signal Signalling control Structure gauge Signal bridge Tell-tale Train stop Wayside horn
Structures	Coaling tower Motive power depot/Railway workshop Platform Roundhouse Shed for trains for goods Station building clock Water stop