Transport for London (TfL) has apologised after passengers were trapped on a broken down Tube train for three hours during the evening peak, then forced to walk along the tracks to safety.
Footage from inside a faulty Jubilee line train, which became stuck between Westminster and Waterloo stations on Monday night, shows passengers filing out of what witnesses described as "hot and completely packed" carriages.
One passenger, Nadine A, told the BBC: "For about an hour or more we had no updates at all, not even from the driver, because the power was out."
A TfL spokesperson said: "Engineers are working as quickly as possible to restore a good service on the line."
There were still severe delays on the Jubilee line throughout Tuesday morning, with the service part-suspended for a period between London Bridge and Green Park, although trains are now running.
Nadine A, who filmed the evacuation, told the BBC it took 30 minutes after the train stopped for any communication.
She said: "Eventually, the driver made an announcement over the intercom saying there was an electrical problem in another carriage. We were not given much detail but we saw an engineer passing through.
"After about 40 minutes, they tried to continue the journey towards Westminster, but the train stopped again and you could feel something was not right.
"The driver repeated the same message about needing to check things.
"Then they told us the train would reverse back to Waterloo instead of continuing forward but on the way back, the train broke down again and the electricity just shut off completely."
She added that "the evacuation itself was very organised and safe", with passengers getting "back on to the platform without any issues".
TfL added: "We apologise to Jubilee line customers who were held on a faulty train yesterday evening and to those customers whose journeys have been disrupted by this incident, which involved the incident train and an additional faulty train."
Additional reporting by Alex Akhurst
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