268 POWER DISTRIBUTION FOR ELECTRIC RAILROADS. 
moderate voltage and relatively low frequency meets the 
requirements. 
That fast electric trains over long disiances are soon 
coming, no one who is conversant with the art of electric 
traction can seriously doubt. How extensive such service 
will be, how far it will supersede present methods, and 
what methods out of those which are now practicable will 
survive competitive trial—these are questions for the 
prophet rather than the engineer.