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Hump master in a Chicago and Northwestern railroad yard operating a signal switch system which extends the length of the hump track. He is thus able to control movements of locomotives pushing the train over the hump from his post at the hump office; Chic
by The Library of Congress
by The Library of Congress
No known copyright restrictions(著作権制限なし)

Activity in the Santa Fe R.R. yard, Los Angeles, Calif. Due to blackout regulations, flood lights, switch lights, locomotive headlights and lights on the bridge in background have been shaded to cast light downward. Broad streaks of light are caused by pa
by The Library of Congress
by The Library of Congress
No known copyright restrictions(著作権制限なし)
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