Passenger trains are trains that carry passengers. Goods trains are trains that transport freight or cargo. Mail trains are trains that are used to transport mail.
A combined mail and passenger train is a train that carries both passengers and mail.
The difference between slow and fast trains is the speed at which they travel. Fast trains travel at a higher speed than slow trains.
A non-stopping train is a train that does not stop at every station along its route. It does not necessarily mean that it never stops, but it makes fewer stops than a regular train.
By a local train, you can get to places within a city or its suburbs. By a long-distance train, you can travel to cities or regions that are far away.
You can see suburban trains at train stations in or near cities. They can take you to the suburbs of the city. They are called suburban trains because they serve the suburbs.
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