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Subway (Metro) Line 4, Budapest, Hungary | by marcell_katona
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Subway (Metro) Line 4, Budapest, Hungary

Fun Fact: This subway line is on the list of the world's most expensive transport infrastructures, with a total cost of 2.1 billion USD which is almost twice as much as the total cost of the Sanghai Maglev Train. While the maglev's route is more than twice as long.

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Taken on April 19, 2014