Australian designer Hamit Kanuni Kuralkan has designed a train for people who don't want to have anything to do with other passengers.
It reminds me of an interview I read with one of The Ramones. I can't remember if it was Dee Dee, Johnny, or Joey, but he said when The Ramones eventually got to the point where they hated each other, they used a special tour bus with four rooms built into it. After a show, they'd get on the bus without saying a word to each other, go into their room and shut the door. When they got to the next city, they'd get out without saying a word, do the gig and go back to their rooms on the bus. Avoid Interaction With Other Humans in New Train Design (Treehugger)