That is true. I believe they have regular bike racks (six) to strap the bike on. That is very convenient. I lived in Seattle and used to take my bike to Vancouver and Portland the same way---very easy.
I wish they have the same on all lines. I find it puzzling that a huge train, with many cars, cannot afford space for a 20lb bicycle! Even more puzzling, why are people not screaming about it.
If anyone knows of an advocacy group working to get Amtrak to carry bikes, let me know (or hey, may be I should start!).