General merchandise freights
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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
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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
Accommodation trains
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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
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take people to and from work in a large city. Commuter trains make many stops, but the stops are very short