Note that if there something, anything actually left from rail itself (not just “road in the city is named Railway Street”) and mapper surveyed location then I am fine with mapping it.
Few years ago I was quite confused why grading alone would be sufficient but got convinced that it makes sense to map former railway in such cases.
What I have problem is mapping based on 150 year old map without considering or caring is it still having any actual traces.
BTW, maybe a good idea would be to have some systematic way of indicating how railway remains visible in terrain?