. Electric railway journal . MONT-CENIS ELECTRIFICATION—OUTLINE MAPS OF LINE tunnels. In 1911 the en-gineers of the ItalianState Railways proceededto design the systemwhich has since producedexcellent results, first onthe Mont-Cenis line andlater on other Italianlines. Electric operationwas considered superiorto steam in many caseson account of the greatercapacity of line, higheroperating speed of trainsand greater regularity of operation. Three-phase cur-rent, at cycles and 3700 volts pressure, was selectedas standard. Arrangements were made with powercompanies in the region of the Mont-
. Electric railway journal . MONT-CENIS ELECTRIFICATION—OUTLINE MAPS OF LINE tunnels. In 1911 the en-gineers of the ItalianState Railways proceededto design the systemwhich has since producedexcellent results, first onthe Mont-Cenis line andlater on other Italianlines. Electric operationwas considered superiorto steam in many caseson account of the greatercapacity of line, higheroperating speed of trainsand greater regularity of operation. Three-phase cur-rent, at cycles and 3700 volts pressure, was selectedas standard. Arrangements were made with powercompanies in the region of the Mont-Cenis electrifica-tion for the supply of high-tension current. Production and Transformation of Current Until 1914 power was furnished in the form of three-phase current at 50,000 volts, 50 cycles, by the hydro-electric plant at Chiomonte and the steam station atMartinetto. It was transformed to lower frequency ina motor-generator substation at Bardonneche. As therailway circuits operated in parallel with the light and. MONT-CENIS ELECTRIFICATION—VIEW OF SUBSTATION ATSALBERTRAND MONT-CENIS ELECTRIFICATION—MOTOR-GENERATOR SUBSTATIONAT BARDONNECHE September 1, 1917] ELECTRIC RAILWAY JOURNAL power circuits of the city of Turin, supplied from theplants above mentioned it was at first considered neces-sary to provide against interference with the opera-tion of trains due to variations in the light and powerloads. For this purpose heavy flywheels were includedin the rotating elements in the Bardonneche substa-tion. Each motor-generator set comprised a 2500-hp.
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