> Best practice is to not have them.
So no food options on a 14 hour train? The train's losing a lot of captured audiences there and people like to... eat. In that time the average US person eats at least three meals, you simply can't pack that much, especially for a family.
> Do it at the end of the line when the train is stopped.
Ever been to a music festival and looked at the toilets at the end of the day? Now imagine you're in a semi-airtight tube with that for 14 hours.
> Amtrak is a bad example for anything. They are running tourist trains, and should follow the practices of cruise ships not modern railroads
Have you ever taken one on the East Coast? They are not tourist trains, they're commuters and travelers.