When it opens next year, the Elizabeth Line (Crossrail) will have a state-of-the-art ventilation system that not only removes the air pressure caused by the trains, but also keeps platforms and trains cool, maintenance workers supplied with fresh air, and – crucially – extracts smoke in the event of a fire.

For the system to work, the Tunnel Ventilation Control System (TVCS) has to process a complex set of logic that ensures the 48 fans, 160 dampers and over 500 actuators that control the airflow in the tunnel shafts operate whatever the situation.

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