The Bakerloo line is baking, with temperatures in its central London tunnels exceeding 32 degrees.

ECONOMIST: London Underground

Two previous strikes have been held at Bakerloo Line and Northern Line depots over the issue.

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Police have now released CCTV images of Speight boarding a southbound Bakerloo line Tube from Queens Park station.

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There were severe delays on the Bakerloo line and minor delays on the Jubilee line due to a signalling systems failure.

BBC: Paddington rail service returns to normal