Devil's Advocate
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So I was trying to actually book my big epic trip from SAS to SEA. I thought (apparently erroneously) that AGR would hand me the very last unoccupied room no matter what. But that does not appear to be the case. In my situation I'm joining the Coast Starlight at Sacramento. I wanted Emeryville but the lady insisted that's not possible. Anyway, everything was going fine up until this point. The Amtrak website shows this particular CS with at least SIX roomettes still available for the whole distance from LAX to SEA. However, from Sacramento to Seattle it shows zero. Zilch. Nada. And that's exactly what I got from AGR.