The electrified rail threatens electrocution of anyone wandering or falling onto the tracks. This can be avoided by using platform screen doors, or the risk can be reduced by placing the conductor rail on the side of the track away from the platform, when allowed by the station layout. The risk can also be reduced by having a coverboard, supported by brackets, to protect the third rail from contact, although many systems do not use one. Where coverboards are used they reduce the structure gauge near the top of rail. This in turn reduces the loading gauge.