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The positioning of your various facilities is crucial, since you will need to ensure they’re linked up to keep your supply lines running smoothly. Helpfully, clear markers show where you can and can’t build, while thin dotted lines appear if a potential connection can be made between, say, your refinery, engine factory and garage – though you will still need to link them manually. Eventually, you will need to extend your infrastructure to be able to deploy more powerful units without having to spend several turns moving them across the map. Which is where repeaters come in handy, splitting the input along multiple output lines. You will, however, need to keep all this protected: a single break in the chain could potentially be catastrophic.