The California Zephyr, the Empire Builder and the Sunset Limited offer multi-night rail journeys and extraordinary views of America that only a long-distance train trip can reveal.

Amtrak's most iconic ride wasn't always the experience it is today. Here's a look at the history of the California Zephyr.

Tunnel 41 allows people on the California Zephyr to pass through the most treacherous part of the California trail with ease.