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Inside of the First class cabin
In Mongolian and Russian train, there are FIRST CLASS compartments. Actually, either in Mongolian, Russian and Chinese there has first class cabin. But, in Chinese train it is named as DELUXE CLASS.
In per first class carriage, there have 9 cabins with 2 comfortable berths. So, there have only 18 passengers.
1 – 2 serving attendants (often bilingual). There has 2 toilet rooms and without shower. But in Chinese deluxe cabin, two rooms are 1 shared shower. Of course, there has spacious long corridor with windows. You can see sightseeing or breathing fresh air and feeling nature.
Further, hallway and cabins are cleaned 3-4 times per day. The standard first class usually includes just bedding. In Trans Mongolian train, meals are not included. So, you need to eat meals in restaurant car. The advantage of first class apart from the extra privacy if you are traveling as a couple will be fewer queues for the toilet in the morning and you are closer to the dining car!
First-class Sleeping Carriage

Note:
*On the trains there is normally a plug on the corridor (so the provodnitsa can vacuum the carpet!) and in first class there may be a plug in your cabin. Electricity is 220 v AC voltages. You will need a European type power plug with two round pins (similar to the two pin round plug in China as well) Often the power on the train is switched off and we have heard of entrepreneurial conductors charging portable devices in their cabin overnight, for a price.