According to Amtrak's Train Status (via their iPhone app - the website seems to have no information), the 49/449 arrived in CHI at 6:48pm. No information seems to be available about the fate of 48/448 and 30 tonight - I had heard somewhere that tonight's 30 would be bustitution to TOL (where the train would start), and 48/448 would be via the Michigan route, but nothing on the Amtrak website.
Too bad I have no idea when 48/448 will be passing through, as I might want to see it pass through ARB - it would be a rare sight to see the LSL pass through Michigan...