Which of the following is a proper action for a no-ticket passenger?

Contacting customer service for guidance is the proper action for a no-ticket passenger because it shows a proactive approach to resolving the situation. By reaching out to customer service, the passenger can seek assistance regarding their options for obtaining a ticket or clarifying policies. This action reflects an understanding of the importance of following procedures and ensures that the passenger can comply with Amtrak's ticketing requirements.

Engaging with customer service can also provide the passenger with valuable information about any available routes, pricing, and ticketing processes, which may help them avoid further complications. It is crucial for passengers to understand and respect ticket requirements to maintain order and efficiency in the travel process.