Image: Hall disc signal 1909
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Description: View of disc-style railroad signal manufactured by Hall Signal Company. The signal is displaying the "Clear" indication.
Title: Hall disc signal 1909
Credit: "The ABC of Railroad Signaling." p. 7. (Chicago: Mackenzie-Klink Publishing Co.)
Author: W. H. Elliott, New York Central and Hudson River Railroad.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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