in "obshii" you do not have a designated sleeping bank. There are sitting places for every ticket sold, but not for sleeping. You may take a nap only in shifts.For platzcart they will sell 6 tickets (2 - alongside ind 4 per coupe). in "obshij" there will be 6 per coupe and 3 aside. This kind of travel may be usable only for a real short distances in remote areas.