1. Passenger trains are trains that carry passengers, goods trains are trains that carry goods and mail trains are trains that carry mail or post (letters, newspapers parcels, etc.)
2. Combined mail and passenger train is a train that has carriages for passengers and a special carriage or two for mail.
3. Slow trains stop at every station and fast trains stop only at very large ones.
4. Non-stopping train doesn't mean that it never stops. It means that this train is fast and doesn't stop at every station.
5. By local trains you can travel not very far and by long-distance trains you can travel for thousands of kilometers.
6. Suburban trains are located in large cities such as Moscow or Kiev. Suburban means that by this train you can go to the suburbs of the city (пригород).
7. Because there is no through train to the place of destination we need.
8. It is convenient because through train usually have sleeping accommodation.
