Railways require system specially designed for train despatching where all telephone traffic on circuit along certain railway section is controlled by train despatcher, whose duty it is to direct and control train traffic along railway section in question; two such systems, developed by Ericsson, are described. See also Engineering Index 1938 p 1006 and Engineering Index 1939 p 990.
Telephone in service of railways
Ericsson Rev
Ericsson Review ; n 2
1939
7 pages
Article (Journal)
English
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