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necessitates the whole fleet being withdrawn for inspections!