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# 575 on the F line stored between runs at tower #2. Platform detail. Note valve next to ventilator, IFA signal is run by an arm drops and trips this valve throwing train into emergency. Has to be manually reset. J.G.Graham Collection Courtesy of the Oa

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Stash   [Jan 04, 2005 at 06:07 AM]
Those tripper arms, when installed on the new articulated units, controlled the pantograph. Trip board moved arm which released pantograph when leaving third rail territory. Rake off blocks raised the third rail shoes.

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