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In page Coal-fired power station:

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Coal is delivered by highway truck, rail, barge, collier ship or coal slurry pipeline. Generating stations are sometimes built next to a mine; especially one mining coal, such as lignite, which is not valuable enough to transport long-distance; so may receive coal by conveyor belt or massive diesel-electric-drive trucks.[1] A large coal train called a "unit train" may be 2 km long, containing 130–140 cars with around 100 tonnes of coal in each one, for a total load of over 10,000 tonnes.[2] A large plant under full load requires at least one coal delivery this size every day. Plants may get as many as three to five trains a day, especially in "peak season" during the hottest summer or coldest winter months (depending on local climate) when power consumption is high.[citation needed]