Joel N. Weber II
Engineer
Extra rows of windows on Superliner III sleepers might be doable, although it needs to be done in a way that keeps the design of the car adequately structurally sound.And the extra "comfort" for the top bunk passenger in a Viewliner because of the higher ceiling and the extra band of windows up there? What would it take to add both of these, into a modified Superliner design?
The convenience of the Viewliner's luggage storage cubby? What would it take to add an in-compartment storage area for luggage into a modified Superliner roomette?
The extra vertical space for the upper bunk and the cubby is a bit more challenging; you'd probably have to make a car that's taller than a standard Superliner, and then there's the question of whether most / all of Amtrak's routes have adequate clearance, and whether you can keep the center of gravity low enough to keep the car safe enough. Double stack container trains are a few feet higher than a Superliner (I think it's 20.5 feet vs roughly 17 feet), so depending on what fraction of the Superliner routes are double stack compatible, maybe there's room to make the next generation cars taller, but double stack freight does occasionally run into issues with high winds knocking things over.