Highball Signal
Signals of this type were used on early railroads to control train movements. When the track was clear, the station agent would hoist the ball, permitting the train to proceed. The signal is listed in the National Register of Historic Places.
USGS Historical Topographic Map CollectionDavid Rumsey Map Collection, Stanford LibrariesDavid Rumsey Map Collection, Stanford LibrariesDavid Rumsey Map Collection, Stanford LibrariesDigital Commonwealth, Boston Public Library
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