I have a 2 foot link of lift chain from the Blue Streak from Conneaut along with some spikes, and a few pieces of the trains that fell off when I worked there.I also have a load of lumber.I also have the 'wait behind yellow line' sign that hung over the station. I have a track section of the Racer from Kennywood, with some structure wood.
I have some wheels off of the train on the Time Twister from Jolly Roger in Ocean City, now in Malaysia, along with some electrical components.
From Cedar Point, I have some wheels and parts from White Water Landing,and I have the Avalanche Run sign that was at the end of the 'q', with the little knob that turns the time to wait indicator. (that was quite a feat getting that off of park property.)
From Morey's Pier's, I have tons of wood from the Great White, I have a saw blade used in the cutting, I have some extra angled steel pieces from the structure, and I have some pins from the Great Nor'Easter that holds the coach to the chassis. They make great door stops.
Actually I have enough signs to warrant renting one of those storage units. If I ever need money one day, I will just have a ebay special.