it's from a rollercoaster simulator called nolimits . As far as i know you can't export these rollercoaster meshes, and he deffinatly did not make the 3d models, there's an editor the simulator comes with which is pretty much like an advanced rollercoaster tycoon.
anyway, how many times do i have to tell the noobs, a rollercoaster is NOT POSSIBLE IN BATTLEFIELD. Now stop trying and thinking it is, it's been tried many times before and it always fails because the game engine sucks, and there's nothing special that you can do to make yours work beyond everyone elses. __________________