Last month, the Elizabeth line faced two days of chaos due to a signalling system breakdown. The problems began early in the morning, leading to a cascade of issues that left the central core tunnels closed, affecting passenger services. Problems with communication, signalling, and manual control plagued the system, with delays and uncertainty about when the service could resume. After multiple reboots and fixes, the line finally reopened, only to face another failure the next day. Despite the challenges, the team worked tirelessly to restore full service, only to face a new obstacle with a cracked rail crossing. The saga continues for the Elizabeth line.
https://www.ianvisits.co.uk/articles/signalling-chaos-inside-the-elizabeth-lines-two-day-breakdown-78097/