Passengers might soon be able to travel from London to Tokyo on the Trans-Siberian railway via a 13,500-km route, according to an ambitious proposal by the Russian government. The project would involve constructing a 45km bridge that would allow trains to cross the East Sea. Beginning in London, the train would take travellers through the heart of Russia before concluding in Wakkanai, Japan. The trip would be one of great topographic value, with trains passing through Germany and Poland before entering eastern Europe. Passengers would also pass through the Siberian Mountains before reaching the proposed bridge, a blueprint for the route shows. Reportedly keen to boost investment in the eastern parts of Russia, President Vladimir Putin is in serious talks with Japanese officials to kickstart plans.Currently , travellers can take the Trans-Siberian railway from Beijing through Mongolia and onto Moscow, arriving in the Russian capital in as little as 15 days.