Coming from Beijing via Mongolia into Russia there are still the same rip-off exchange touts, but most if not all platform vendors in Mongolia and Russia take . dollars or euros. However, they take only bills (or notes), so know the exchange rate and buy a lot if you are using a five euro note. Always ask the attendant how much time is available before you rush off into a station to find a Bankomat (ATM) because the train will not wait for you. If you are not spending time in Mongolia, avoid acquiring Mongolian tögrög. They are worthless virtually everywhere else, and the export of tögrög is technically forbidden. Therefore, spend dollars or euro, but get rubles immediately because Russian vendors are more likely to fabricate exchange rates than Mongolian or Chinese platform vendors.