[Tagging] rail routes: how are platforms and stops associated (rail question 2)

[Colin Smale]

Just to add a dimension... At many stations in NL and UK at least,
trains of different lengths stop at different places along the platform,
roughly so the middle of the train is by the exit. So this will need
multiple stop positions on each platform. These are signed for the train
driver.

On 2017-05-10 18:59, Bjoern Hassler wrote:

> Hello again, 
> 
> In an  osm:relation:route [1] (type=route, route=train/...), you have both platforms and stop positions. How is a particular platform associated with a stop that serves it? 
> 
> E.g. for public transport routing, you'd walk (highway=footway) to a platform (public_transport=platform), at which point you'd change to a train stopping at a stop (public_transport=stop_position). How would the routing algorithm know that the platform is associated with the stop?  
> 
> Is there an existing mechanism or convention, e.g. a tag on the platform that indicates the stop, or both tagged with the same name or similar? 
> 
> Thanks! 
> Bjoern 
> 
> PS I've noticed that sometimes the stop position is at the far end of a platform (i.e. the two stop positions are at opposite ends of the station). Maybe that's so that an association can be made? 
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Links:
------
[1] https://wiki.openstreetmap.org/wiki/relation:route
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