Tube passengers were forced to evacuate trains after a power failure at Canning Town last night trapped them in tunnels.
Jubilee Line commuters were trapped in hot conditions and had to walk along tracks to safety.
The whole line was shut shortly after 7pm.,
Transport for London said four trains were stalled.
Passengers on one train that had been heading north from Swiss Cottage were eventually led through the tunnel to Finchley Road - which has a platform above ground.They had been trapped on the full train for more than an hour and were evacuated in groups of 10.
A TfL spokesman said: “There was a power failure towards the eastern end of the line at Canning Town.
“As a precaution, the line was closed, due to the high traffic.”
A signal failure also caused the District Line to close between Edgware Road and High Street Kensington.
The line was operating normally this morning.
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