[Tagging] Mapping of Subway Stations

[Ilya Zverev]

Hi,

I had a task of extracting subway infrastructure from OpenStreetMap, and 
I found out that some things cannot be mapped at all (e.g. 
interchanges), and some are unclear or mapped differently in different 
countries.

Please consider this proposal that clarifies tagging and mapping of 
subway stations:

https://wiki.openstreetmap.org/wiki/Proposed_features/Metro_Mapping

I have already started improving the mapping of several metro systems in 
different cities. Mostly that involves adding stop_area and 
stop_area_group relations.

Adhering to this document would greatly simplify using subway data from 
OpenStreetMap in applications — both for multi-modal routing and for 
formatting pretty schemes.

Thanks,
Ilya