Aboard comfortable overnight trains, seek out the beauty of America’s metropolises and wild expanses on one of the top three most scenic Amtrak routes.

The story of Glacier National Park begins with the railroad. It continues today with a Great Rail Journeys aboard the Empire Builder to to the Crown of the Continent.

Here are five things you need to know before taking a trip on the Going-to-the-Sun Road, a gem of Glacier National Park, and one of the country’s most scenic byways.