I have to say, this article on the train cost is pretty interesting.
In the article, they talk about the Mongolian railway car transportation cost and how much it would cost to get your train to a place like Mongolia.
The article talks about how much the train would cost if you take the train from a Mongolian train station to the Mongol city of Mongol.
This article is a pretty good read and I think it is a good reference for any Mongolian reader.
Here is the Mongol train cost article for those interested in Mongolians train cost.