I spent 15 hours in a roomette on an overnight Amtrak train for $400. I made 4 mistakes I won't repeat on future rides.

Business Insider's reporter has four regrets from her recent overnight Amtrak trip.

Joey Hadden/Business Insider

• I traveled from Denver to Salt Lake City on an overnight Amtrak train in January.
• I booked a $400 roomette accommodation for the 15-hour train journey.
• I made a few mistakes along the way, from not knowing dining etiquette to skipping a rest stop.

I took an overnight Amtrak train from Denver to Salt Lake City in January. I spent the 15-hour journey...