All railroad intercommunications handled on private system which, at minimum operating expense, has capacity for normal operations as well as peaks. (See also Ry Signaling v 34 n 9 Sept 1941 p 473-5)
Illinois Central uses automatic telephone system on Chicago terminal area
Ry Age
Railway Age ; 111 , n 22
1941
Aufsatz (Zeitschrift)
Englisch
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Illinois Central uses automatic telephone system on Chicago terminal area
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