I slept in private rooms on overnight trains in the US and Europe. The experiences were completely different, but I'd book both again.

Source: Business Insider

Business Insider's reporter booked overnight train rides on Nightjet and Amtrak trains. Joey Hadden/Business InsiderI took an 11-hour overnight train from Venice to Vienna in 2023 and booked a private cabin for $200. I took a 53-hour Amtrak train from Chicago to California in 2026 and booked a bedroom for $2,200.