Transport for London (TfL) has apologised after two Tube trains broke down forcing passengers to walk along the tracks to a working train.
The Victoria Line was suspended on Friday evening between 1830 GMT and 1945 GMT after "defective" trains at Oxford Circus and Warren Street.
A TFL spokesman said all passengers were put on working trains and given bottles of water by 1930 GMT.
The Rail Maritime and Transport (RMT) union said the Tube was in "meltdown."
RMT general secretary Bob Crow said: "The combination of cuts and mismanagement right from the top drags the network into a spiral of decline."
Transport for London apologised to passengers for the inconvenience and said an investigation would be carried out into the circumstances.
"We are working minute by minute to improve reliability on the network," he added.