I like the idea to see ex-railway cycleways on the map. I also like to see cycle routes on the map, and I would like to see ex-railways on the map.
I have my doubts whether the tagging of a cycleway as being on a n ex-railway should be done at the level of a key to the highway tag. If I understand your proposal correctly a typical tagging would look like this highway=path bicycle=designated foot=designated surface= xxx width= xxx ref= xxx rail_trail=yes I see several problems whit this approach: If the ex-railway continues, as it often happens on a piece of normal raod, not on a designated cycle path, would you add railtrail=yes to highway=secondary. If you don't do that the rendering will be interrupted. Then I do not see how you would instruct the routing algorithm to prefer the railtrail ways over other cycleways I think that the better way is to use a route relation for this. The proposed tag could be an additional tag of the cycle route relation, provide that the entire cycle route is based on a an ex-railway. So we would have a normal cycle route relation that has an extra tag that a renderer could use to show the route differently form a “normal” cycle route. Yet another possibility would be to create an ex-railway relation and render it independently form the cycle routes. In the map you would see cycle routes and ex-railway routes in different representations on the map. Where they coincide you know that your cycleway is on an ex-railway Volker Padova Italy
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