No...White lightning was built and tracked on-site (
photo). Prefab wood coasters from Intamin like Colossus and El Toro have their track pre-assembled prior to shipping and arriving on site (
photo). Those bars are the track stacks, and if you look at
this picture you can see the white mounting brackets that the track stacks are attached to.
With wood coasters, prefab refers only to the track system, not the support structure. Sometimes the support structure will come already partially "assembled" in sections (especially for low sections or sections of larger bent structures for high turns or such), and is much easier to do with steel structures, though I've seen them do it with wooden structure as well.