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Videos & Photos Photos Photo Of The Day Leverage

Leverage

By Angela Cotey | May 6, 2016

| Last updated on December 18, 2020

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Pulling the correct lever is an important matter for operators of Metra’s Tower A2 in western Chicago in September 2013. This pneumatic lever machine uses brass rods to trigger air pulses to switch more than 100 points on Union Pacific headed due west out of downtown. Photo by Steve Sweeney
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