Commuters faced travel chaos at the start of the Easter getaway when four Tube lines came to a standstill due to signalling failures.
Swathes of the District, Circle and Hammersmith and City lines were not running on Thursday evening as a result of a problem in the Plaistow area of east London.
Furious passengers took to social media complaining that trains had not moved for up to an hour.
TfL said that a "loss of power" caused the failure of the signalling system.
There was no service at all on the anti-clockwise Circle line, and no service between Whitechapel and Dagenham East on the District line and Moorgate and Barking on the Hammersmith and City line.
All three suffered from severe delays into the evening.
Later the Piccadilly line was hit with suspended service and severe delays after a signal failure at Wood Green.
And earlier in the evening London Overground trains were not running between Edmonton Green and Cheshunt, also the result of a signal failure.
One furious District line commuter wrote on Twitter: "I’m sorry but what is going on. 3rd time in 4 days you’ve had a “signal failure” on the district line. Are you serious?"
Another said: "I hate you with every inch of my heart and soul @distrcitline."
It comes after the Standard revealed that District line Tube passengers are hit by more delays sparked by signalling problems than on any other line.
A TfL spokesperson, said: “We apologise to our District, Circle and Hammersmith & City line customers for the delays to their journeys this evening.
"Our engineers are working hard to fix the signal failure as quickly as possible and restore a normal service.”
The company advised that tickets could be used on London buses, the Overground, South Western Railways, Great Western Railways and C2C.
