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I quite agree The best way to promote Amtrak is for Amtrak to clean up many of the problems it has. Problems relating to the on-board experience. Rude attendants and incompetent Amtrak staff, booking difficulties, unclean restrooms , poor food quality, and unacceptable on-time performance These things don't exactly promote interest and enthusiasm for potential Amtrak riders. I am getting to the point where I don't like to suggest an Amtrak trip to friends, as so many people have a negative experience after taking an Amtrak train.
I think Amtrak could be promoted with video route guides, not just on YouTube, but though other media outlets such as PBS. Let PBS have a series on Amtrak, showing many of their interesting train routes. Show various Amtrak train stops around the country, displaying fun things to see and places to go in each stop along the way. Have the videos, for a number of the routes, presented on the Amtrak website.