Application of type C and type D carrier systems to non-standard lines

One of the greatest fields for the use of carrier, in any case, is in bridging the gap between the time when an existing open-wire line is fully loaded (assuming no use of carrier) and the time when toll cable can be proved in over this route, the object being to eliminate the need for building new open-wire leads which in a few years more would have to give way to cable. 

Under prevailing economic conditions this possibility of using carrier is being exploited to the utmost in the endeavour to extend the period of life of all existing pole lines. This paper is the first portion of a detailed description of the carrier-system layout for Roumania.