I traveled in a roomette and a shared bunk on overnight trains in the US and Europe. One was worth the additional $420.
Briefly

Traveling by train can involve various options for overnight accommodations, ranging from shared bunk cabins to private rooms. An Amtrak roomette provides a private 20-square-foot space with beds and a toilet for $500, while a Nightjet bunk cabin is a shared 74-square-foot space accommodating three travelers for $80. Both experiences were compared based on comfort and value, revealing that the additional cost of a private room was justified for enhanced comfort during the journey.
The Amtrak roomette offered a 20-square-foot private space with beds and a toilet for $500, providing comfort for overnight journeys.
The Nightjet bunk cabin, costing $80, provided 74 square feet and was shared with three travelers, offering a different experience in Europe.
Read at Business Insider
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