Well, I wanted to do the same thing on the last one, when I have an idea I need to get out and do my idea and be first..LOL
Don't aim to be the first, aim to be the best! In any case, that shot's been done millions of times before, including a nice variation by Steve Carter who frequents here. I won't post a link though, since I don't want to encourage folks to try it.
That said, I really discourage folks from trying that last one. It's downright dangerous. With the wind in the Gorge, it's amazing just how quiet trains can be, especially when they're heading downgrade. Believe it or not, they can sneak up on you. I'd hate to see the caption read "This was the last shot he ever took..."
Yes, I know, you'll be careful, you'll hear the train, you won't get distracted by trying to compose your photo and not realize a trains coming until it's too late to get out of the way. Lots of trespassers get killed every year, and they all said that too.
Oh, and due to all the windsurfers in the area crossing the tracks, BNSF has special agents in the area that will give you a ticket for trespassing. The last time I was down there, I had one watch me for about 10 minutes as I waited for Amtrak to arrive. I stayed on the edge of the public road, next to some concrete blocks they have by the tracks, which looked to be defining the propertly line, and I didn't try to cross the tracks, so he left me alone, but he was very definitely keeping an eye on me. So even if you don't get run over, it could be an expensive shot.
OK, so you've still just gotta try it, right? I hope not, but if so, please use a spotter to watch your back and look out for trains.