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Thank you everyone for your helpful answers! This community seems really nice!
The kind of train I'm thinking of is a cargo train used to transport all kinds of goods, not sure if it's a train or a locomotive.
The parts I was talking about are ones that can be replaced (for example in the engine) if they stop working, when the train is stopped. Not sure if this is very helpful in better understanding my vision.
I think you've given me something to work with! Thank you all again for sharing you knowledge with me!
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