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Dependable devices deter drivers protection by the case
Pennsylvania Railroad maintenance workers R. L. Schumann and H. W. Simpson display relay boxes near Mohawk Avenue Warren that control blinking lights at crossings. Each circuit is powered from regular lines and shorted by an approaching train to activate lights. If power fails the system switches to DC storage batteries to keep warnings active.
MENTIONED IN THIS ARTICLE
R. L. Schumann
H. W. Simpson
Pennsylvania Railroad
Mohawk Ave
South Side
Warren