Problem is Amtrak has teetered on bankruptcy for a while and the gov't for the most part does not want to fund rail transportation. I suppose that makes sense since Amtrak is in part a gov't agency whereas the airlines are private and have large lobbies and don't need an alternate form of transportation. Someone has a long way to go to tell them adding a baggage car for bikes (or redesigning a few cars to eliminate seats) will pay for itself plus a profit.