From the perspective of Amtrak customers the Alpine station seems to be little more than an unstaffed waiting room with a help desk window pained on the wall, so I'm not sure what there is to lose or gain? I doubt UP is leaving the building since it's a crew change point. Maybe they're kicking Amtrak out of their waiting room. Probably doesn't matter much except for when the train is running late on a cold day. That's when I'd still like to have that waiting room available.