Hi there, Guten Tag!
I was investigating a rendering issue for the OpenRailwayMap for station rendering around Berlin, considering the S-Bahn (light rail) and the normal train network.
For example Potsdam Hauptbahnhof (Node: Potsdam Hauptbahnhof (30232718) | OpenStreetMap and Node: Potsdam Hauptbahnhof (3421260909) | OpenStreetMap) has both an S-Bahn and railway station. However the S-Bahn station is both tagged with light_rail = yes and train = yes.
Other S-Bahn stations next to a train station have similar problems, for example Teltow Stadt (Node: Teltow Stadt (2514084207) | OpenStreetMap) and Griebnitzsee (Node: Griebnitzsee (27318370) | OpenStreetMap).
The result is that there will be 3 separate station nodes on the map: one for the light rail station and two for the train station, because a station is split for each type of vehicle calling on the station. And the train “part” of both stations cannot be grouped together because the railway reference is different: BPDH versus BPD. I would expect 2 stations: one for light rail only (BPDH), and one for trains only (BPD).
I was wondering why the S-Bahn station is tagged with train = yes, if no trains call on that (S-Bahn) station, and if the train part of Potsdam Hauptbahnhof is (correctly) tagged as a different station node.
Is there a mistake in my thinking, or should be train = yes be removed from Node: Potsdam Hauptbahnhof (30232718) | OpenStreetMap?
(Sidenote: we can change the station grouping and rendering of the OpenRailwayMap of course, but I first want to understand the station tagging a bit better.)