TfL said the Northern line was partially suspended on Thursday between Camden Town and Morden via Bank after a signal fault at Stockwell. The line had reopened earlier after a trackside fire at Stockwell, then went down again in the afternoon.
The second disruption left no service on the affected stretch while engineers worked on the signal failure. TfL said severe delays were expected on the rest of the Northern line, adding to disruption for commuters in southwest London.
Stockwell on Thursday
The sequence mattered because the line did not stay closed after the first incident. It reopened following the trackside fire, with severe delays still reported, before TfL later said it was once again partially suspended because of the signal fault.
That left passengers dealing with a changing service pattern rather than a single fixed closure. The disruption on Thursday also came as the Piccadilly line faced delays from a signal failure at Arnos Grove and the Bakerloo Line had severe delays because of train cancellations.
Camden Town and Morden
The affected section ran between Camden Town and Morden via Bank, with the service later described as having no trains on that route. For commuters in southwest London, the practical result was a broken run across a major part of the line rather than a short local stoppage.
TfL said engineers were working to fix the signal failure at Stockwell. Whether the signal fault at Stockwell was linked to the earlier trackside fire was not answered, leaving the cause-and-effect chain unresolved even as the disruption continued.
