Maybe the Friends have umpteen things to worry about keeping the railroad operating this season, but that shouldn't really stop progress on something like this. Why don't those who want to see this figure out what it would take to make something like this happen and work with the Friends to execute your plan. Maybe it really isn't possible to do the entire train, but there are a number of possibility to get close.
Maybe there's a multi-billionare out there who would fund it. We won't know that until we go looking.
I think time is running out to save stuff that hasn't had attention in many years. And if this generation doesn't do it, will the next one care as much ? I can see it now. Someday I can image having my son tell me he's working on an Amtrak Superliner restoration project.