I claim the ornamental design for a trakline belt buckle, as shown and described.
FIG. 1 shows a rear perspective view of the trakline belt buckle showing a rear, top, and left side thereof;
FIG. 2 shows a front perspective view of the trakline belt buckle showing a front, bottom, and right side thereof;
FIG. 3 shows a front view of the trakline belt buckle;
FIG. 4 shows a rear view of the trakline belt buckle;
FIG. 5 shows a left side of the trakline belt buckle;
FIG. 6 shows a right side of the trakline belt buckle;
FIG. 7 shows a bottom view of the trakline belt buckle; and,
FIG. 8 shows a top view of the trakline belt buckle.
The trakline belt buckle as illustrated is shown with a logo consisting of the word “TRAK” above the word “LINE”, and two arrows positioned to the bottom right corner; the logo is being illustrated in dashed lines and does not form part of the claimed design.