When we bought the pool they told me the liner was a beaded liner. From what I've read, when you have a beaded liner you do not have to remove the top rails to replace it. I was in the pool today and looked up under the top rail and I couldn't see any track (not sure what you call it) that the liner snaps into. I don't see how it could be replaced without taking the top rails off??? Are some different or is my liner not beaded ??