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

[Bjoern Hassler]

Hi Colin,

Ah - that may also explain why sometimes the stop is marked at the end of
the platform.

Having said this, I interpret the notes on the wiki for railway=stop /
public_transport=stop_position to be the "logical stop".
https://wiki.openstreetmap.org/wiki/Relation:route#Members says on node (as
stop): "The order of the members in the relation should be identical to the
order in the timetable." Of course it doesn't say the "number of members"
should be identical, but that was my assumptions, and I would have normally
marked these centrally somewhere.

So perhaps for these physical stop positions a different tag is needed?

Bjoern



On 10 May 2017 at 18:15, Colin Smale <colin.smale at xs4all.nl> wrote:

> 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
> <https://wiki.openstreetmap.org/wiki/relation:route> (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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