I believe that the monorail beams were a custom concrete, but @Tom would know for sure.OK, so keeping things in terms of what one would see around WDW....are monorail pylons 4K? or just the legendary footings? What of the legs holding up SSE, I know I saw some pic where they appeared to be steel skeletons, but were they wrapped in concrete later? What attraction around the property has the deepest poured support?
If I am not mistaken, the legs that you see on spaceship earth are concrete encased steel girders attached to friction piles.
I am also pretty sure that SSE has the record for the deepest foundation at 189' +/- (@marni1971 will know the exact number right off the top of his head)