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.