I am taking the Capital Limited in Chicago and it arrives around 9am, I then will be taking the Cardinal out to Indianapolis in the evening around 5:45pm. During that time I plan on stepping out and seeing Chicago. I have checked the union station web site and they show locker availability for a nominal fee. Is that my only option for storage of my bag during my layover and if so does anyone know where those lockers are located in the station in relationship to where they to where my train will arrive.