Mongolian Transit Visas
Transit visas are used by people who travel via Mongolia from one country to another without stopping and are slightly cheaper than tourist visas.
A transit visa is a specific type of visa for people who are travelling (or transiting) through Mongolia to a third country without stopping or breaking their journey on-route, for example, going to China from Russia via Mongolia overland by train.
You may not use a transit visa if you are returning to the country that you entered Mongolia from, for example entering from Russia and then going directly back to Russia again and you should not use a transit visa if you intend to stop over in Mongolia, in these cases you should use a tourist visa.