Shoreline East doesn’t run to Mystic, it’s last stop is New London. Old Saybrook is probably safest for cars, but New London would rank next along the track. It only gets worse the close you get to NYC.

I’ve parked in New London many times for nights, or over nights and never had a problem. But it’s one of those things where one person will never have a bad experience, but then someone else will get their car broken into in the 10 minutes they left it alone.