As we cross the snaking, single-track bridge there is a glimpse of Loch Shiel, and of the monument that marks the spot where Bonnie Prince Charlie first assembled his Jacobite army that nearly did so well for the Scots.

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The first stage of work is focused on increasing train speeds on 23 miles (37km) of track between Norton Bridge and Crewe from 75mph to 100mph.

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The steep track on the other side of the bridge looks even worse, cut by even deeper gullies.

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"The Whole Love" seems like a celebration of that freedom, with songs that roam happily all over the place: "Capitol City" is a country waltz with bits of Dixieland clarinet, "Sunloathe" sounds like the Beatles if they were still together in 1974, and the vaguely psychedelic folk-pop title track takes Simon and Garfunkel's 59th Street Bridge down to the Small Faces' Itchycoo Park for a summer-breezin' picnic.

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The course leads racers on a track over the cathedral's steps, to a bridge crossing a main thoroughfare.

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Ned Temko, former editor of the Jewish Chronicle, told the Sunday programme that Lord Sacks would be a "difficult act to follow" but he said Rabbi Mirvis's track record as a "conciliator" might help him to bridge divisions within the Jewish community.

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Using multi-colored lights strung across the length of the upper walkway, technicians have created a gigantic interactive exhibit wherein sensors located at either end detect travelers' Bluetooth-enabled gadgets (cellphones, laptops, PDA's, etc.) and then track their progress in pseudo-real-time as they move across the bridge.

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Strengthening of the bridge will also mean that a 5mph speed limit on that section of the track can be increased to 15mph.

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