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Freight train operations on the Chicago and Northwestern Railroad between Chicago and Clinton, Iowa. The rear brakeman signals the engineer to apply and release the brakes as a test. This is the "release" sign. Sourced from the Library of Congress.

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Freight train operations on the Chicago and Northwestern Railroad between Chicago and Clinton, Iowa. The rear brakeman signals the engineer to apply and release the brakes as a test. This is the "release" sign. Sourced from the Library of Congress.

More