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The Trans-Siberian Railway connects Moscow with Vladivostok and is with its 9,718 km the world's longest railway. Apart from its main line to Vladivostok, it also has three other lines. One of these goes via Mongolia to Beijing in China. The trip from Moscow to Vladivostok takes around 6 days. From there, you can connect to Pyongyang, the capital of North Korea. This takes another three days on the train.