The usual procedure to remove powder coat is to bake it somewhere around 500 degrees. There are strippers that claim to remove it, but I have not had much luck wth them. It also depends on whether the rails were sanded for better adhesion before they were coated. Removing it should be easy for any powder shop with a large enough oven. If they are aluminum, then they will be far easier to re-polish than if they were stainless!