Welcome to OSM.
I've reverting your changeset. The railway=station node is distinct from entrance tags, of which there may be many, scattered well away from the actual station, especially in London. Station nodes for 2 platform, two track station the node should be placed between the tracks & near to the middle of the platforms.

Is there a building with barriers & ticket office etc?:
https://wiki.openstreetmap.org/wiki/Tag:building%3Dtrain_station 