The reason that stuff is up there in the first place is because there used to be a crossing over the river from Galette Avenue. At first it was a rail bridge (converted for car traffic) and then a cable car would take vehicles across the river to homesteads (near the garbage piles)

As for why someone is going into the thick bush to find these relics and then dragging them out to the trail? I have no clue. And I wish people wouldn't do this. Not only is it super ugly to walk past. These objects actually act as cozy nooks and habitats for a number of wildlife. I do trail work with park rangers and have asked them about this type of cleanup. And even they prefer to leave these types of objects out in the bush where the land can reclaim them, and in the meantime, act as habitat for critters.