More than 90 passengers had to be evacuated from a Tube train and walked to safety through the tunnel following a track fire, London Underground (LU) said.
Passengers were stranded for 40 minutes
Fire crews were called to a small track-side fire on the Bakerloo Line at
Embankment at about 1340 BST, a LU spokeswoman said.
During the incident, one of the trains stalled in the tunnel and 94 passengers were stranded on board for 40 minutes before being walked down to Waterloo station.
The incident was one of three to affect rail and tube networks in London during the day.
Charing Cross train station was closed and evacuated just after 1600 BST following reports of a fire under an overland train at a platform.
London Fire Service were dealing with both incidents and the Charing Cross closure risked massively affecting Connex and South Central services on Friday afternoon and evening.
The Underground fire left Bakerloo services out of action between Elephant and Castle and Piccadilly, but they have now reopened.
A spokesman for London Fire Service said the causes of both fires, which are being treated separately, was still not known.