Thanks for all the advice. I've decided to keep waiting for now after looking through the reservations system. I checked to see how often the roomettes on the Coast Starlight are total sellouts, since that's the only issue I have with waiting is the chance the one I'll need will be gone by the time I'm officially told the bad news. I discovered that unlike a lot of other LD trains, the Starlight rarely runs out of roomettes. Between now and the date I'll need, I found only three roomette sellouts, all around Thanksgiving. If I wanted one for today's or tomorrow's train, I could have it. And the date I'd maybe need is just a non-holiday, Tuesday Feb. 10th. Still, I'll keep an eye on it.