I don't really understand this.. What I got out of it was that wood will be laid on top of the red I-beam, then the steel sheets would be put on top of the wood so that the wheels on the coaster car could run. So basically the I-beam will just act as the backbone of the pieces of wood and the coaster's "track" (the part the wheels actually touch). Is this right though, or are they saying that the red I-beam is what the coaster's wheels will run on...?