Frustrated commuters faced long waits as signal failures sparked severe delays and suspensions on three major London Underground lines.
Technical problems at Earl's Court and Wembley Central caused issues that ran into rush hour on the Bakerloo line and Circle and District lines.
The Circle line was suspended completely and District line passengers faced severe delays from about 2pm on Wednesday.
The signal failures left passengers struggling to get home from work as the line was still part suspended at 7.20pm.
No service on the entire line due to a signal failure at Earls Court.— Circle line (@circleline) April 19, 2017
Pictures emerged of huge crowds battling to board trains at Earl’s Court during the rush-hour chaos.
Furious passengers took to social media to vent their anger about the five-hour long signalling problems.
One wrote on Twitter: “When this line wants to mess up it does proper and very often as well.
Another said: “What are you doing about the dangerous overcrowding on Barking Station caused by emptying several trains and gaps of 30mins?”
One traveller described the scenes at Earl’s Court as “carnage.”
No trains were running between Harrow and Wealdstone and Queens Park on the Bakerloo line due to the second signal failure on the Tube network.
A TfL spokeswoman said said there was no service on the Circle line because of the signal failure at Earl's Court.
She said: "There is no service between Harrow and Wealdstone and Queens Park while we fix a signal failure at Wembley Central.
“Tickets will be accepted on London Buses via any reasonable route.
"We apologise to customers for the disruption, and are working to fix the problems as soon as possible."