The different types of trains in Russia are : regular, express and high-speed. The trains which travel long distances are usually the regular and express trains. It is possible to sleep in those. The Sapsan and the Allegro train are high-speed trains and drive for example St. Petersburg-Moscow (Sapsan) or St. Petersburg-Helsinki (Allegro).
The long-distance trains are separated into three types: first class (SV), second class (Kupe) and third class (Platzkart). In these trains you will have beds in which you can sleep but some additionally have seating carriages. The difference in the different classes is the amount of beds in one enclosed room:
First class: two beds
Second class: two lower and two bunk beds
The third class doesn’t have an enclosed room and has 4 beds.
In the regular and express trains you can expect modern comfort and high-quality services. Very often these trains possess a restaurant. Besides this, you may order foods or drinks to your seat. In the most modern types of these trains it is common to have an air-conditioning plant, heating systems, Wifi and a TV. You may order coffee or tea any time you want additionally there are deliveries three times during the ride. The high-quality services also contain pure water, cleaning your sleeping room and giving information. Each train bears its own name and has its usual route. There are some trains which take the route between Moscow and Saint Petersburg as they are: Smena, Red Arrow, Grand Express, Two capitals and Aphanasius Nikitin.
Sapsan is a new high-speed train taking the rout between Saint Petersburg and Moscow with a speed up to 250 km/h. In the train you can find two business class carriages, seven economy class carriages and a board restaurant with an total amount of 554 seats. Read more about 'Sapsan' trainsThe Allegro counts also as an high-speed train which takes daily routes between Saint Petersburg and Helsinki. Read more about 'Allegro' trains