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London's Northern Line has been experiencing travel chaos for the fourth consecutive day due to signal failures near Stockwell. The issue stems from a malfunction in equipment that informs the network of train locations, requiring Transport for London (TfL) staff to manually guide drivers. This manual process significantly reduces train frequency, leading to lengthy delays, overcrowding, and cancellations across the line. TfL has advised commuters to avoid the Northern Line where possible and utilise alternative transport routes, with valid tickets accepted on other services. Despite ongoing engineering work, the exact cause of the signal failure remains unidentified, and engineers are working to resolve the fault.
