Thankyou to all the seasoned travellers. I think the nerves are because I don't know what to expect. The only rail car adventure I've been on is the sight seeing one in Alaska. I was scared to death.... they have summer students driving this thing. I was feeling all good about it till I saw where we were going. The hubby road between the cars taking pictures, and I lay on the floor of the train, with all the sweet seniors patting my back...lol...
One thing you need not worry about is the engineers on Amtrak trains in general, and the Empire Builder in particular. They are all old, terribly experienced, and know their routes like the backs of their hands, every signal, every grade crossing, every switch. You'll be on BNSF's mainline, which is maintained to very high standards, if only because of the vast number of fast container trains that go on it. You're vastly safer on the train than you are driving U.S. 2, and the seats are more comfortable than those in any automobile. When was the last time someone got hurt on the Empire Builder? 1945?
I'd say take a deck of cards along, but my wife and I are very attached to the deck we bought on the Empire Builder, with the train's logo on the back. I'd echo those who suggest taking snacks, especially fresh fruit and raw vegetables. Walk the train, enjoy the lounge car, get at least the occasional meal in the diner. If you try the broasted chicken dinner they take on in Havre, let us know how it is. Get out at the longer stops (Minot, Havre, sometimes Shelby) and stretch your legs and admire the big, beautiful train. Try to upgrade to a sleeper if you have a chance and can spare the money.
Talk to your neighbors -- they often are the most memorable part of any train trip.
One thing, it's a long way to Portland, and even longer to San Francisco. Don't look at your watch or calculate how the train is keeping time. It won't make the train any faster, and time won't pass any faster. This is the time for big, trashy novels, that knitting project, long pieces of music on your Ipod, whatever.
Most of all, enjoy all of the great country you'll be traveling through.
Damn, now I want to take the Empire Builder again.