Abstract: The guide rail is one which is adapted to be mounted on a glass balustrade on an escalator. The mounting is accomplished without the need to drill holes in the balustrade or to apply any adhesive to the balustrade. The guide is formed with a groove in its lower surface which receives the top edge of the balustrade. The groove is flanked by gripping legs, one of which can be tightened against the balustrade by means of set screws, in the manner of a vise. The set screws are threaded into a handrail slide portion of the guide and are completely recessed therein so as not to interfere with the handrail.