FIG. 1 is a bottom, front, left side perspective view of a first embodiment of a side rail;
FIG. 2 is a top, front, left side perspective view of the side rail of FIG. 1;
FIG. 3 is a bottom, rear, right side perspective view of the side rail of FIG. 1;
FIG. 4 is a rear view of the side rail of FIG. 1;
FIG. 5 is a front view of the side rail of FIG. 1;
FIG. 6 is a right side view of the side rail of FIG. 1;
FIG. 7 is a left side view of the side rail of FIG. 1;
FIG. 8 is a top view of the side rail of FIG. 1;
FIG. 9 is a bottom view of the side rail of FIG. 1;
FIG. 10 is a bottom, front, left side perspective view of a second embodiment of a side rail;
FIG. 11 is a top, front, left side perspective view of the side rail of FIG. 10;
FIG. 12 is a bottom, rear, right side perspective view of the side rail of FIG. 10;
FIG. 13 is a rear view of the side rail of FIG. 10;
FIG. 14 is a front view of the side rail of FIG. 10;
FIG. 15 is a right side view of the side rail of FIG. 10;
FIG. 16 is a left side view of the side rail of FIG. 10;
FIG. 17 is a top view of the side rail of FIG. 10; and,
FIG. 18 is a bottom view of the side rail of FIG. 10.
The broken lines in the drawings depict portions of the side rail that form no part of the claimed design.