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

Colin Smale colin.smale at xs4all.nl
Thu May 11 09:39:31 UTC 2017


Hi Bjoern, 

On 2017-05-11 11:17, Bjoern Hassler wrote:

> HI Phil, hi Colin, 
> 
> Colin: Actually, in the case you mentioned (short/long trains), I guess there could also be several stop points. I think that's not a problem. It's just you would only add one of those to the route relation. For the several stop points, ideally there would be a note, saying "front of train, 4 carriages" or "front of train, 8 carriages", or maybe an additional tag of some kind.

So which one would you choose to add to the route? 

Fundamentally I think the definition of a "route" is the list of places
where a stop is made. A rail route links stations. If the 0900 train
uses platform 1 and the 0930 uses platform 2 then that is not a
sufficient distinction to say they are on different routes. So the
detail of stop position is definitely going too far for the definition
of a route. 

Veering a little off-topic, we have a bit of a challenge in the tagging
of multiple tracks. There is no way at present to group multiple tracks
into a single entity. If there is a quad track from A to B and they are
mapped as individual tracks of equal status, then they all have to part
of the route from A to B (assuming they are truly equivalent). It would
be better from a data modelling perspective to have the *route* use a
single line ("logical track") between the stations. 

--colin
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