I spent 2 nights in an Amtrak bedroom and tried both bunks. The smaller bed won me over.

Source: Business Insider

The author booked a bedroom on Amtrak's California Zephyr and slept in both bunks. Joey Hadden/Business InsiderI spent two nights on Amtrak's California Zephyr train and booked a $2,200 bedroom with two bunks. I spent the first night in the top bunk and the second in the lower cot.