To be competitive and attractive, the projected local and regional "rapid rail line" will run between San Juan and Caguas up to an ideally maximum 85 mph , operating wholly on dedicated rights-of-way in the center of highway PR-52, covering the distance between the two cities in about 15 minutes (for comparison, an automobile takes about 20 minutes in non-rush hour time and may take up to 90 minutes in rush hour).