[Tagging] railway=subway_entrance vs railway=train_station_entrance

[Michael Tsang]

Hi all,

railway=subway_entrance is widely used for station entrances, where the wiki 
says that "A subway entrance is a place where people enter or exit a subway 
(metro) station." However, there is also a similar tag called 
railway=train_station_entrance, which is not as widely used (and not rendered 
on OSM Carto), which the wiki says "A train station entrance is a place where 
people enter or exit a train station." The remaining contents are nearly the 
same in both articles, and I believe they are the same concept.

Can any clarify if there are any actual differences in the usage of these two 
tags? For example, there is a fixme placed at City Thameslink station, which is 
an underground mainline railway station, on the railway=subway_entrance tag 
questioning if it is the right tag for an entrance to a station, which serves 
the same function of a subway (metro) station but carries mainline trains 
instead. In addition, there are also multi-modal stations which can be used to 
access mainline trains, metros and trams at the same place like Wimbledon as 
well.

Thanks,
Michael
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