Answer depends on what your trying to accomplish.
The railing may have vinyl insert trim covering screws. Can be pulled out and later replaced with new insert trim.
What are you trying to do?
If your trying to replace awning fabric getting the fabric out at the coach may also depend on your make and model but often removing the front or rear gutter downspout if so equipped will allow you to slide out the fabric from the rail. Removing the fabric from the roller tube is different.
Lots of YouTube videos on replacing awning fabric.
Hope this helps