Amtrak allows private rail car owners to hitch a ride with its trains across the country.
Amtrak's insane train boarding rules - Vox
Amtrak lets railcar owners hitch a ride to its trains — for a price
Riding the Coast Starlight, from Los Angeles to Seattle
The Best Amtrak Train Ever Has 11 Private Passenger Cars
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Train derails after colliding with county vehicle
These Are The Top 5 Overnight Sleeper Trains In The U.S. This Fall - Travel Off Path
X Train: a gamble from Fullerton to Las Vegas – Orange County Register
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Amtrak state of mind: What if America took its train system seriously?