High-priority freights
carry important goods that must reach their destination at a ceoain time, goods such as food or first-class mail. Schedules are fast with very little switching
General merchandise freights
carry almost any kind of non-priority cargo. These trains are often long with many kinds of cars; switching may be done at most yards along the way
Way freights
switch nearly all spurs and sidings along a route. They relay their cars to main yards where the cars are put on high-priority or general merchandise freights
Limiteds
usually feature newer cars and stop only at the most important cities. They will carry few, if any, baggage and mail cars; station stops are short.
Accommodation trains
stop at most or all cities on a run. They often carry a lot of baggage, mail, and express cars, and some station stops may be long so that these cars can be loaded and unloaded.
Commuter trains
take people to and from work in a large city. Commuter trains make many stops, but the stops are very short.