I enjoy traveling by train, but doing so can take preparation.Diana KruzmanI have traveled across the United States several times on various Amtrak trains.My experiences have been overwhelmingly positive, but I've run into some issues.Now, when I board a train, I prepare for unexpected delays, crowded cars, and spotty cell reception.Over the past few years, I've done a lot of train travel.I've crisscrossed the US several times on Amtrak trains f…