A Central Line train of 1991-2 stock approaches Woodford station on the 6th July 2003. Following an incident at Chancery Lane at the end of January 2003, when a traction motor became detached from the train, the whole fleet were taken out of service so that modifications could be made to them. In all the history of the London Underground it was unprecedented for a whole fleet of trains to be suddenly withdrawn and operations on a Line totally halted. Normal service was not resumed until just before Easter. 
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Photo from James & Martin's Picture Collection Copyright 'Jampics' m.hawkes7@ntlworld.com