London Crossrail's £19 Billion Delay
The Greatest Software Disaster in Transport
Crossrail was Europe's largest infrastructure project. The physical tunnels were practically finished. The failure was invisible — the signalling software from three different vendors could not communicate with each other. Leadership fostered a 'good news only' culture, hiding the truth from sponsors until it was too late.
What Happened
Crossrail was Europe’s largest infrastructure project, with tunnels stretching 73 miles under London. The physical construction — boring machines, stations, track — was largely completed on time. But the programme collapsed at the integration stage. Three different signalling systems from three different vendors had to communicate with each other in real-time, and they could not. The leadership team had fostered a culture where only good news reached the board. When engineers warned that the software integration was 18 months behind, executives buried the report. By the time the truth emerged, the delay had grown to 30 months and the budget had overrun by £4 billion. The Elizabeth Line finally opened in May 2022, nearly four years late.
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