Commuters are facing travel chaos this morning after five London Underground lines were hit by delays.
The Circle, District, Piccadilly, Victoria and Hammersmith & City lines were affected by severe and minor delays and part suspensions.
Services running clockwise were halted before delays were reported across the entire line.
The Hammersmith & City line was also hit with delays due to the faulty train.
District line commuters were facing severe delays and a part suspension between High Street Kensington and Edgware Road before it eased to minor disruption.
TfL also warned of severe delays between Ealing Broadway and Turnham Green earlier due to a signal failure in Ealing Common.
The Victoria line was hit with severe delays and a part suspension while a faulty train was fixed at Seven Sisters.
Commuters on the Piccadilly line were also facing severe delays due to the earlier signal failure.