Jarek 🚲
http://wiki.openstreetmap.org/w/index.php?title=Key:subway redirects to http://wiki.openstreetmap.org/wiki/Proposed_features/Public_Transport#Stop_position, which would suggest that it should be the stop position (in this case, http://www.openstreetmap.org/node/443129213 and the one in opposite direction) that has subway=yes, and not the platform. Am I reading that right?