The engine and three of the carriages went off the tracks.

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The free 4G service will be available for three months with 40 traditional Hackney carriages in London and 10 in Birmingham decked out with the state-of-the-art technology.

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But perhaps the most bizarre incident came at the start of this year, on the Feast of the Epiphany, when diplomats from the Spanish embassy, dressed as the Three Kings, went in horse-drawn carriages through Old Havana throwing out sweets for children.

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