Were there plans out there that would have shoved the Builder to 20 cars (not counting PVs)? Also, wouldn't a train that long need at least some additional food service capacity? Even in coach, you'd have both the issue of "the walk" (having to walk 10 cars to get food), not to mention the sheer passenger load on either the diner or the cafe. Remember, when Amtrak ran the super-CONO a year or two ago, there was a second cafe.