My favorite treat at CR/PC was the malt/shake they called the "One-In-A-Million". It was so thick that it was difficult to draw up into the straw, and was made with real Ice Cream... no softserve.
As a kid, I watched them make it, and discovered that they used only a splash of milk, so what you got was mostly partially-melted ice cream. I tried the technique in my Mom's blender and was able to make a fairly good malt or shake at home.
You could get a banana malt/shake, where they used a half of a fresh banana... not just banana-flavored syrup. Another one was the 'Double Chocolate' where they'd give you both chocolate ice cream, and chocolate syurp... Double Yum! (not to borrow a quasi-cutesy Check Please expression).
There were stores in Berwyn, on Oak Park Ave... just north of the Burlington RR station; in Riverside, on Harlem and Ogden; and in Downers, on Fairview, among others. The Harlem and Fairview locations became White Fence Farm fried chicken outlets.
=gordon=