Check out and transfer to the train station. The first leg of your journey will last just about one day. This weekly Trans-Siberian Train N3 leaves Beijing every Wednesday morning. The 7,621 km (4,735 mile) journey takes 6 days. This train cuts across the Gobi desert and Mongolia, then crosses Siberia. This train has deluxe soft sleeper (2-berth compartment, 1st class) and soft sleeper (4-berth compartment, 2nd class). Travelling in winter is as beautiful - and safe - time as summer is, and autumn in Siberia is a as beautiful as spring in Mongolia can be.