I understand your point and I agree to a certain extent. I suppose the real question is, what is the meaning of the network tag in a network relation? Your point of view is that, in this case, it should refer to the over-arching network. That is a reasonable point of view, although it raises the further question of what the network tag should be in a network relation that doesn’t have a higher level network, for example London Underground. I suppose it could be omitted in that case, for consistency. I don’t have any objection if you want to change it, but it might be worth doing nothing until the naming of the London Overground lines come into effect later this year. I suspect that, when that happens, there will be a de-emphasis on the London Overground name and the mapping community might propose that the whole London Overground relation hierarchy is tagged with network=National Rail.