Other lines that closed at a broadly similar time (1950s-1960s) and have little to no physical features left are in OSM/ORM though? I am currently in Germany and this type of decades-old closed line are still everywhere, especially where similar to this one they have clearly had a big influence on the shape of property boundaries and modern road layouts as we can see on the section between Hawkesbury River heading west through North Richmond town. I see your point but in my personal opinion I would like to see these old former rail alignments with nothing left in the ground still displayed so people can see what we lost, where things are similar, what lead to the modern features of the area certainly when they were previously a key part of the landscape and have an ongoing if not obvious presence.