roller costers
the best
all roller coasters have 3 wheels up stop wheel a helper wheel and 3rd wheel . a up stop wheel help's you stop when you go over the hill .you have to clamp the train on the track and roller coasters can get pretty fast like 100 miles . all roller coasters have exelorations flexibility and generators plus motors . they are made of alot of different things like Mendel .some have loops and some are scary some may be tall dangerous and fast .
roller costers rock!
you have to love roller coasters
every roller coaster is the best