I normally use the Bolton line if I'm over that way. I haven't seen anything like that in the last few years. I myself remember noting something once on the route: an industrial works (possibly cement works) had sugar cube lanterns that were SIDE ENTRY! full size like the post top ones in Asda car parks, but side entry. I also remember noting a couple of GEC Z9480's on 10m concrete columns.
The industrial site you mention sounds like it's probably up at the Leyland end of the route.
RE: Neville Hill
There used to be some telegraph pole mounted lanterns as you pass the traincare depot going towards Leeds City Station on the right hand side.
Is it these?Yes. But they're actually concrete columns. And they're still there. If you're round that way (preferrably with a riot shield, considering that particular area!) then have a look, as there is a fence and then parkland.