No, but that doesnt mean its impossible.

Well then its not one of the active methods used to reverse trains. So they just inter-change track pieces?

Well, to tell you the truth, there arent really any multi car coasters that actually go fowards and backwards on a full circut, so there arent really any other benchmarks to compare with. On expedition everest they will probably just use a larger version of reversing systems used on smaller coasters, eg a bigger turntable, a longer transfer track ect.

Yer, I agree. To be honest, I don't think the trains will have many carriages as its harder to deliver a story and special effects etc. to heaps of people. Most Disney adventure rides with lots of themeing and effects (e.g. Slpash Mountain, Indiana Jones etc) have single carriages. Does Big Thunder Mountain have animatronics and special effects?

yes it does.... quite a lot actually for what could be classed as just a coaster. not as much, obviously as indiana or splash mountain, but sufficient to the ride's design.

Does it have slow sections of track to add to the story? And also, does it have a lift hill (or is it relatively flat)?