Faster, cleaner, greener: What lies ahead for the world's railways

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Faster, cleaner, greener: What lies ahead for the world's railways
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Rail is the only transport mode currently well placed to provide the backbone of our future mobility needs.

is a new CNN Travel series that spotlights some of the most fascinating topics in the travel world. In May, we're riding the rails as we explore the world's greatest train journeys. Whether you're looking for travel inspiration or insider knowledge, Monthly Ticket will take you there.Faster, cleaner, greener and packed with advanced technology; rail is the only transport mode currently well placed to provide the backbone of our future mobility needs.

This poses a huge threat to the world's rail companies, which have relied on this lucrative, predictable source of revenue for since the mid-19th century.But, as we approach the 200th anniversary of the first passenger railway in 2025, it's become more important than ever for trains to deliver sustainable mobility in a world facing the challenges of climate change, increasing urbanization and population growth.

To keep these fast-growing cities, regions and megacities moving, efficient public transport is not just desirable, but imperative. Now, the established high-speed heavyweights in Japan and China are looking beyond"steel-on-steel" technology to develop trains capable of up to 373mph . Japan's first bullet train left Tokyo in 1964 running an average of 80 mph. High speed lines now run all over the world and the newest ones are pushing 370 mph.as an alternative to short-haul air travel and to provide lightning-fast trips across its densely populated city regions.

Around $240 billion will be spent integrating transport, energy, water and telecommunications networks, including the development of new high-speed underground metros traveling at up to 160kph and dozens more metro, tram and train routes. While metros, trams and other urban railways aren't as"sexy" as their speedier cousins, there's no question that they make a much greater contribution to national economies and the life of our cities.

Automatic operation has been around for many decades -- London Underground's Victoria Line has been partially operated in this way since it opened in 1967 -- but usually limited to self-contained lines with identical trains running at set intervals. In North America, diesel reigns supreme -- especially on the dominant freight railroads -- and there's little appetite for electrification of the kind seen in Europe and Asia.

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