Last night I made a reservation for August on the LSL (Boston) to CHI -> SWC to TUS. For add-ons, the Amtrak web site asked me if I wanted to include a bike and, oh by the way, bikes were sold out. I don't know if this means there are a limited number of bike slots available but my particular train was sold out, or if all bike slots are listed as "sold out" for all 448/449 for the indefinite future. Maybe because baggage and bikes are still available on the 48/49, it was easier to change the web site to mark all bike slots on the Boston section as sold out than to remove the option completely.
(This didn't affect me as I'm not planning to bring a bike.)
I will have two wheelie duffel bags, a large and a medium, and would like to check the large one through, but I've lugged them in the past, and I can fit both of them in the overhead in a VL roomette. I'll leave the big one (camping gear) on the luggage rack downstairs on the TE/SL unless they let me check it in Chicago. One time as I was boarding the EB in Chicago, the SLA volunteered to put it in a luggage area over the front truck of the sleeper. At least, that's where I thought she put it, she wasn't gone long enough to bring it all the way to the baggage car, I think. (I half expect someone to tell me I'm wrong, there is no such storage area, she must have put it in the baggage car, but there wasn't any baggage tag on it when I got to Seattle, just my name tag...) Then, about a mile north of CUS, we stopped because a door/hatch on the side of one of the cars (mine, I think) was OPEN! The SLA reassured me that my duffel bag hadn't fallen out and couldn't possibly have fallen out, but I was a little paranoid all the way to Seattle, where it was fine.