Abstract
INTEREST in ACSR for railroad signal and communications circuits was stimulated by the copper shortage which occurred during the Korean War and has continued since that time. Because such circuits may be used for communications frequencies up to 150 kc per second as well as for 60-cycle power and direct current, lack of information regarding the communications characteristics of ACSR has retarded its use. In addition, there has been need for accessories and connectors considered suitable and for information regarding mechanical installation and performance. Progress in overcoming these obstacles has now been made to the extent that a test section of line has been constructed by the St. Louis and San Francisco Railway Company.
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