The following infographic shows some of the top rail journeys in the world. The Trans-Siberian Railway is by the far the top train trip in the world for the sheer distance it covers and the landscape it passes through. The Jacobite is the famous rail line in Scotland that appeared in the Harry Potter movies. The Rocky Mountaineer running through the Canadian Rockies is also another great train journey.
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Source: The World’s 12 Most Amazing Rail Journeys, Global Rail Review