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When will the Paris Metro finally get its Li-Fi?

One of the most ambitious public projects to deliver Internet service via LED light appears to have hit a snag or two, but backers are still optimistic that the enterprise — across hundreds of train and underground stations in Paris — will succeed. RATP, the state-owned group that runs public transportation in the Paris region, hopes to equip 302 Metro subway stations and 66 RER commuter rail stations with Li-Fi, the Wi-Fi-like service that can transmit data by using LED lights rather than Wi-Fi's radio signals.

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