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    GN Class 717

    The 717 trip cock is mounted directly on the metal bogie frame. On the 313s its mounted on a wooden beam which is then mounted on the bogie frame, this gives much better electrical insulation. The rear trip cock on the 717 flashed over the 3rd rail as the unit entered Moorgate causing a small...
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    GN Class 717

    The NCL has ventilation fans both at Moorgate and Poole Street (Poole Street is a service access half way between Old Street and Essex Road). So the NCL does have ventilation.

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