I wouldn't cut it "right at the end". As shown in red there is a copper strap that would bypass a cut in the center rail "right at the end". I'm imagining a Dremel metal cut-off wheel applied at the yellow line. The center rail is clamped down to the black ties in the yellow circles. Cutting as shown would provide 2 tie-downs of the now "loose" short center rail piece at the end.
It wasn't clear if it is acceptable to pull up track to isolate the center rail as Mixed Freight suggests. The "wiper" is the "J" shaped end of the copper strap on the left of the red circle. This mates with the "J" copper strap of the connected track. So you can bend the J so that contact is not made. Then, you need to insure the ends of the center rails of the two track sections don't touch. This can be done with any thin insulating material.
