Details of public address system in use in Illinois Central's outbound freight house, Chicago, Ill, which expedites movement of freight; system includes 33 loud speakers; output from each speaker varies from 2 1/2 to 5 w and value is controlled by varying speaker transformer.
Speakers speed freight movement
Ry Signaling
Railway Signaling ; 38 , n 4
1945
2 pages
Article (Journal)
English
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