Somthing with red stone

me an my fiend made a track that goes pretty far across the world and we placed redstone all underground so it looks neat. when we turn on the track of the redstone it doesnt reach the other end in time for the track to switch to the other, its basicly a turn table, it switchs direction of the track just before your in the minecart changing lanes, just like areal train station.

Is there a redstone limit of how far it can reach. please fix this. we would love it if it would work for our city.