Straybow
SOC-14 1K
It's basically a more private improvement on what was once called Steerage. Bunks, often three high. A small commons with tables, perhaps seating a third of the occupants in shifts for dining. You carry your own food in tins, with a small amount of hot foods available for cash.
The capsule version usually has an automat for food and a common toilet and shower. However, these usually aren't used for more than an overnight. China might have a multi-night capsule train service, but the only thing I could find info on is a 1400 mile bullet train, not multi-night.
Trans-oceanic first class seating is essentially a partitioned, fully reclinable seat with lots of doo-dads for work and entertainment. Actually more private and comfortable than a capsule. You can sit without having to do the cross-legged thing for hours, recline to whatever degree you want, get up and stretch without having to crawl in/out, nor climb up/down. An advanced version could allow a kneeling chair arrangement for those who prefer that. A partition designed for a week of travel might even have a pull-up bar and other exercise equipment built in.
An advanced anchor system would allow seats to be arranged before departure for groups desiring interaction within and privacy without. Maybe even some limited rearrangement underway.
You might be able to have a built-in toilet, heck, maybe even a shower.
