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Overhead



This may put me in the dumb question brigade, but.......

I've been running out Penrith way for years, but musta had the blinkers on.
Today I noticed, on both the up and down between Penrith and St Marys, an
extra wire running alongside the overhead. It would have a wire joining to the
overhead at infrequent intervals, anywhere from about 30 metres to over 100
metres. Does anyone know what it is/what it's for? I can email a couple of
photos if it will help.