Hi Ryan - an old proven method of freeing rusted parts is to put them in a bath of molasses. It is a slow process but you will know if it is working if you get a lot of penecillin on the surface. Your main problem will be to get the tracks into some sort of container, but trust me, it will work. If you go back to my thread on electrolysis derusting in 2004, you will see several posts on molasses. There is also plenty of advice on Google.
Bob