there are 2 different gaps there is the one that Evan Raps, Skogen Sprang, and jamie Burge hit... Even hit it 1st with a straight air then he hit it again , the train came  and he did  a 360 iron cross, then Skogen hit it and did a no Grab Flat spin 3 over it, then Shane anderson hit it with a back flip and finally jamie burge with a straight air.. that was in Chapter 3..
the 2nd train gap at a different location on donner Summit which has about 20 feet more to clear and not nearly as step landing was hit in ski movie 2 not 1, Brad Holmes, rod Adams, kent Kreitler and Jamie Burge hit it, Jamie straight aired it, Kent did a big tucked up 360, Brad holmes a laid out back flip and Rod Adams did a lincon loop... and since then the gaps havent really been hit that much, i think a massive cork