Fast train - these trains stop in bigger towns and are not as fast as express trains. They may be a good alternative for a traveler keeping a tight budget, but since no seat reservations are required, you may end up standing the entire trip, especially during the summer, winter and holidays when thousands of young people are traveling. Local - these trains stop at every station. If you are in a hurry, this may not be the best choice. However, if you decide to travel short distances, this is may be the way to go.
Seats are quite uncomfortable, however, tickets are very cheap.
Remember that tickets are checked either before loading Polish trains or soon after trains depart. They are generally listed on yellow boards. They are generally listed on white boards. Watch this sign , it means that the train is fully reserved. Inc. All rights reserved.