I already gave some impressions of driving in mongolian Minivans for our Gobi Tour. Driving the local busses is somewhat similar. It’s shaky (roads are the same as for the minivans), they don’t have seat belts (despite bad road conditions), are over crowded (no limits on luggage and kids that can be carried on one ticket) and they are however lovingly decorated by their owner. In contrast the driver shows some reasonably pace, resulting in 10h travel time for about 400 km.
Driving in mongolian trains compared to russian trains make a big difference. You are actually happy that you travelmates talk some russian allowing you for a basic communication. Seats are covered with carpets (Mongolians have them covering all kind of seats also in jeeps), you get the instant coffee for free and while sleeping on the top beds you don’t have a safety gitter but a belt preventing you from dropping on the table. And finally, it’s a lot cheaper than the russian trains, but otherwise it are exactly the same trains.