. Electric railway journal . de-veloped, while polyphase operation with stationary transfor-mers for the several sections was rejected because of its un-sujtability for the topographical and operating conditions. Itwas believed that with the ordinary parallel connection of three-phase motors the speed on the level sections would not be highenough or else the heavy grades would impose too much loadon the power station. The advantages of three-phase motorsfor recuperating current on down grades were more thanbalanced by their fixed speed characteristics which would havebeen undesirable on a line
. Electric railway journal . de-veloped, while polyphase operation with stationary transfor-mers for the several sections was rejected because of its un-sujtability for the topographical and operating conditions. Itwas believed that with the ordinary parallel connection of three-phase motors the speed on the level sections would not be highenough or else the heavy grades would impose too much loadon the power station. The advantages of three-phase motorsfor recuperating current on down grades were more thanbalanced by their fixed speed characteristics which would havebeen undesirable on a line of this kind. The principal objection,however, was the additional overhead work as it would havebeen necessary to install and maintain the wires under very un-favorable conditions. The power for the operation of the line is furnished by ahydroelectric station at Cebbia where both 1500-volt and10,000-volt generators are installed. The current from machines is fed directly into the trolley lines at Mesocco,. Bellinzona-Mesocco Railway—A Typical Rock Cut atBenabbia further than 30 meters (98 ft.) apart. In some cases, as illus-trated, it was necessary to attach the span wires to insulatedrosettes set in solid rock. The trolley wire used throughout theroute is of No. 00 round-section, hard-drawn copper. On the bracket sections the wire is carried en Mannesmann seamless
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