I was there a couple weeks ago, didnt notice any on the back car.
Im not sure how rust makes a coaster bad or - gasp - not fun to ride. All woodies have rust. Most all steel coasters have rust. You cant rustproof a coaster and you CANT repaint it every week.
I was bringing it up to your attention because its a really, really lame thing to note on a roller coaster. Considering that all roller coasters have some form of metal on them and it most likly ends up rusting over its first year.
Plus bear in mind the ride sits RIGHT on the lake with no protection and any wind hitting it is the worst winds on the lake - nor'easters coming from the north. That might have something to do with it as well.
And Ive ridden it more times than I can count. Ill be riding it again Saturday as well.
EDIT - Heres coasters with real rust:
http://www.themeparkreview.com/midwest0 ... fkk_21.jpg
http://www.themeparkreview.com/forum/fi ... 40_590.jpg
Check out the drop - entire sections of paint just gone.
http://www.themeparkreview.com/forum/fi ... 71_185.jpg