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Tunnel boring machine
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==Backup systems== {{unreferenced section|date=April 2025}} Behind all types of tunnel boring machines, in the finished part of the tunnel, are trailing support decks known as the backup system, whose mechanisms can include conveyors or other systems for muck removal; slurry [[Pipeline transport|pipeline]]s (if applicable); control rooms; electrical, dust-removal and ventilation systems; and mechanisms for transport of pre-cast segments.
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