We claim the ornamental design for a cable rail system, as shown and described.
FIG. 1 is a perspective view of a first aspect cable rail system showing our design;
FIG. 2 is an endwise view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a rear elevational view thereof; and,
FIG. 6 is a front elevational view thereof.
The broken lines shown represent unclaimed subject matter and form no part of the claimed design.
The claim is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.