All russian cities we visited had a very well working public transport system. It consists of metros, trams, busses, trolleybusses and minibusses.

On the metro, you pay for a coin (Yekaterinburg) or ticket (Moscow) before entering the area.

On Trams, you usually just get on the tram and there's a person where you can buy a ticket in the tram. It has a fixed price, which is usually between 10 and 20 rubels (about 0.25 to 0.50 €), if you need to switch the tram, you pay again. On busses, it's sometimes the same, if there's no person collecting ticket fees, you pay to the driver when leaving the bus. Same with trolleybusses and minibusses.
As long as you know which line to take, this is quite convenient. Usually, all lines come quite frequently, you only wait some minutes if you miss one. There was only one occasion where we had to take a taxi in Russia (to get the ferry to Port Baikal in time - the ferry itself worked like the trams, you pay on the ferry).

In Ulaanbaator, we found it a bit harder, mainly because we never really found out which bus to take (no tram or metro here). The ticket system is the same (you pay to a ticket seller on the bus). The busses here are often very overcrowded. Taxis here are really cheap, so that's what many people use.

Ulan-Ude (Улан-Удэ) was our last stop in Russia, afterwards we took the bus to Ulaanbaatar (Улаанбаатар), the capital of Mongolia.

I don't know why, but the mongolian part of the transsiberian railway is significantly more expensive than the russian part. The bus is a cheap alternative for the first part and it's also twice as fast (12 hours compared to 24 hours with the train). It costs 1000 rubels (about 25 €). We got the ticket through our hostel, so I can't tell where you can regularly buy it. (For the Mongolia-China part, there's also a cheap alternative, I'll write about that later.)

We started at 7 in the morning in Ulan-Ude. I'm usually a bit uncomfortable with long bus trips, especially if they go on curvy roads. Mongolia has nothing like motorways, so the whole ride goes on bumpy roads through the step.

Arriving at the russian-mongolian border, we had a bad feeling, because our migration card for russia was wrong. We got it at the border to Belarus and we didn't know that it's the migration card for both Belarus and Russia - so we only entered the dates and visa number for Belarus and realized that this was wrong when we entered Russia without a second border check. But it turned out our fear was unneccessary - the staff at the border called a colleague to look at the issue, but shortly afterwards we could go on without any more hassle.

Right at the border, we already noticed that in Mongolia, english was much more common than in Russia. Unlike on the russian side, some of the mongolian border officers were able to speak english. After the border, we stopped at a restaurant for a while.

Driving through the mongolian steppe, I felt that the main part of our journey really begins here: The landscape looked very different from everything I am used to and I found it quite exciting. Several times, the bus had to stop or horn for cows crossing the street.

In the evening, we arrived in Ulaanbaatar.

Pictures from Bus trip