Commuters faced serious disruption on Monday morning after three fire alerts at different stations.
The London Overground was severely delayed between Stratford, Clapham Junction and Richmond following an alert at Hackney Central.
One the Central line, travellers suffered delays due to an earlier fire alert at Queensway.
And there were delays on the Northern line due to an earlier fire alert at Morden. All three fire alerts occurred before 7.30am.
London Trams passengers are facing disruption as the Unite union begins nine days of action which is set to affect fans heading to Wimbledon.
