Communications system for centralized checking in Northern Pacific freight houses; each checker in office has console with lines going to all spots in house, and circuitry is arranged so that caller in freight car can use portable loudspeaker or telephone handset when checking freight.
Phones or loudspeakers used in cars
Ry Signaling Communications
Railway Signaling and Communications ; 49 , n 12
1956
3 pages
Article (Journal)
English
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