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This series looks at the iconic trains that have done the most to change history. Each train is an engineering marvel, each one a leap forward in the history of trains and railways. But more than this, these are the trains that made the modern world. These are the trains that unify nations and open up continents, that miraculously shrink distance and create a global economy, changing how we trade, what we buy and make and sell. They change how we live and even how we think, speeding up our lives and expanding our horizons. These are the machines that made us modern. Each episode features one iconic train and describes its impact on railway history and on history in general, combining archive and expert testimony with actuality and hands-on engineering demonstrations.