Commuters are facing delays during rush hour this morning due to delays on the Central Line.
Transport for London said there are severe delays between Leytonstone and White City westbound, and minor disruption on the rest of the line.
According to TfL, the delays were caused by a signal failure at Stratford.
Central Line staff on Twitter advised commuters to find an alternative route, and said they currently had no idea when the issue would be resolved.
Frustrated commuters who were able to get internet signal tweeted to complain about the service.
Since when was nearly 20 mins between trains a "good service' @centralline?
— KS (@sporrington) September 29, 2016