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Is it true that train diesel engines are always kept running and not completely shut down? If yes, why?

Is it true that train diesel engines are always kept running and not completely shut down? If yes, why?

This is actually not surprising when you think about it. Most large engines are left running even when their power output is unneeded as they have long periods of time to start from a cold start. Most power plants take somewhere between quarter to half a day to get up to speed, some coal or nuclear plants take multiple days to reach speed. Cold starts are rough on engines, large engines take a lot of time to evenly heat the block and fully lubricate the engine before they can be loaded.

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