curves misbehaving

this is so simple it is simply annoying.
on another file i put lots of curves. as time passes the curves fill up with a red line - see pic.
what am i doing wrong?
cos although i switched the red bit off a the start and at frame 590 - then it was to finish at 690.
well it is on all the time!
the curve is called toronto cos that is where it leaves from on the map.
i also see another toronto 001 in the animation window but not in the curves thingy!

thanks all


worldtripFIXED CAMERA2.blend (7.94 MB)