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California Zephyr is by far the best train for overnight travel. There's a lot of variety in terms of landscape, and the train is quite nice as well. In contrast to other routes like Empire Builder where the scenery is largely the same, the California Zephyr goes through deserts, mountains, temperate areas, and plains. Also through major cities like SLC and Denver where you can stop and have fun if you wanted to. I would highly recommend it to anyone interested in train travel.
Night Trains in Europe are mostly boring as it has largely died out because of air travel and high speed rail.
