It's established that we use relations for routes, because the components are related geo-spatially to one another (in a particular order, sometimes having particular roles such as forward/backward). If a way forms part of multiple routes, that is fine - just make it a member of multiple relations.
However, when it's a group of nodes that have no geo-spatial relationship, then it's better to avoid using relations, since it's unnecessary, and just adds complexity (duplication is regarded as better than complexity). As far as I can see, the rcn node networks are independent, so all the information could be on the node. I think there may be relation hierarchies in public transport as well. Again, it's better to collect independent routes into a network using tags, rather than a relation. Richard
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