<snip> at the same time), then they would be able > to keep the old wires since higher voltage reduces the need for higher
All the current infrastructure is EOL this is why it is being changed. > current to provide the same power. Of course swapping all that out at > once is not an option, so the voltage is not changing. So instead if you > want more power capacity, you need more current which means thicker wires. > Conviniently that can be done area by area. > > The wires are of course also being updated to work with the pantograph > system, which means fixing all the intersections and curves, and > eventually making the straight sections move side to side a bit rather > than being completely straight (which apparently wears a nice groove > into pantographs). After all the plan apparently is that only the first > 60 or so of the new streetcars will have trolley poles, while the rest > will only have a pantograph (the first 60 have both). >From Wikipedia bit on transport pantograph "Pantographs with overhead wires are now the dominant form of current collection for modern electric trains because, although more fragile than a third-rail system, they allow the use of higher voltages." > > -- > Len Sorensen
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