Hi Dave - it's good to hear of someone actually picking off this line that early and that would have been close to where I picked these up. Is Rollo McDonald still around? That's a name you hear quite a lot from the early days of the hobby. Was his study of 143's ever published? I remember walking part of this line near Marmora around 1978 or 1979 and it was full of glass, probably 5 or 6 crossarms full. Unfortunately, I was more interested in fishing then but I remember thinking how easy it would be to get some of the insulators as the lowest crossarm was within reach just standing on the ground.
I worked most of this line from Havelock all the way to the Agincourt yard during 2000 - 2002 or so. Most of it was picked over very well, but every once in a while a little pocket of good stuff would turn up usually at the farthest point between crossings. I remember there being a few good ones that were on tall poles or within sight of homes that I meant to go back for but never got around to it.