The ornamental design for a multiple positionswing up jump rail support, as shown and described.
FIG. 1 is a back elevational view showing my new design;
FIG. 2 is a left side elevational view thereof;
FIG. 3 is a top elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a bottom elevational view thereof.
FIG. 6 is a front elevational view thereof;
FIG. 7 is a front perspective view of a multiple position swing up jump rail support showing my new design;
FIG. 8 is a back perspective view thereof;
FIG. 9 is an environmental view showing the multiple position swing up jump rail support mounted on a post in an extended position for supporting a rail; and,
FIG. 10 is an environmental view showing the multiple position swing up jump rail support mounted on a post in a retracted position.
The broken lines showing the rail and the post are for the purpose of illustrating environmental structure and form no part of the claimed design.