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If you're asking about the prototype, it varies. Some cars run on dedicated services (coal hoppers, for example) - these will usually run loaded from the mine to whatever industry they serve, then return empty - over here we call these MGR (Merry Go Round...) trains. Intermodals tend to run loaded most of the time, as empty cars aren't earning money for the RR, though you'll often see some empty space in a train. Most industries work on a basis of empties in, loaded out. Empty cars are often coupled at the end of a train - they tend to derail in much the same way as underweight model train cars if placed at the front! This is a rather sparse explanation, hoping someone else with more knowledge than myself can help out here!
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