Well, the "in between" used to be the SLUMBERCOACH. Private (not dorm) bare bones accommodations. Single or double. Amtrak inherited a bunch of them and they were in service until the end of the heritage era. Something like these, updated to current needs and standards, should be available system wide. If labor and linen costs make this impractical, let pax bring their own linens or sleeping bags and coach attendants can tidy up rooms like they do coach seats as pax come and go. Or, if there are multiple slumbercoaches, one attendant could handle more than one car if they don't need to deal with linens. The all-important thing is the availability of private, horizontal sleeping spaces at a significantly lower cost than roomettes and bedrooms. These budget rooms would not need to include meals. They would need to be private (not shared with strangers) as that would meet resistance in the USA. Slumbercoaches used to have in-room toilets and sinks. Nice but unnecessary if you have ample restrooms down the hall. People of all ages -- not just younger folk -- would be attracted to this type of accommodation.