Nine lines ran limited services, while the Piccadilly line operated a shuttle service between Heathrow terminals and Hammersmith, and between Arnos Grove and Cockfosters.

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The Piccadilly line is operating a shuttle service between Heathrow terminals and Hammersmith, and between Arnos Grove and Cockfosters.

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In the next room, phone operators sitting at computer terminals took calls from employees to Valero's emergency hot line.

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When I visited last month, a team from Egyptian Telecom was hunched over PC terminals in a classroom lined with ZTE servers for fixed-line networks.

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