2California Zephyr (USA) – 3,924 km

The California Zephyr is one of the longest train journeys in the United States, covering 3,924 kilometers (2,438 miles) from Chicago to Emeryville, near San Francisco. The three-day journey takes passengers through some of the most picturesque landscapes in North America, including the Colorado Rockies, the Sierra Nevada mountains, and the Great Plains. The route offers stunning views of snow-capped peaks, rivers, and canyons, making it one of the most scenic train rides in the world.