The concourse at Waterloo was packed with frustrated commuters this evening, as services were affected by the hot weather.
South West Trains put speed restrictions in place between Clapham Junction and Waterloo - because the tracks were struggling to cope with surface temperatures approaching 50 degrees Celsius.
Trains were limited to 20 miles an hour, with many services delayed, cancelled or altered.
More top news
Services on major rail routes between London and south west England have been severely disrupted after a person was hit by a train.
The business executive, whose ruthless interviewing technique has won him many fans, is replacing Nick Hewer, who quit after a decade.
Recent opinion polls show Labour within striking distance of capturing the trophy seat of Finchley and Golders Green.