wrote:
http://www.telegraph.co.uk/news/2017...fire-oxford-ci
rcus-causes-evacuation/

Equipment failure or some tunnel rubbish caught in one of the shoes perhaps
that caught fire?

Nigel Holness, London Underground's director of network operations, said:
"The cause of the smoke was an electrical fault under one of the carriages,
which resulted in a small fire that was quickly extinguished."

http://www.bbc.co.uk/news/uk-england-london-40897094

Let's hope it's not a generic fault with the elderly 1972TS that
necessitates the whole fleet being withdrawn for inspections!