Welcome to OSM,
Look for railwaytagging here 
https://wiki.openstreetmap.org/wiki/OpenRailwayMap/Tagging
Ik think the parking is parking=surface and not multi-storey
See https://wiki.openstreetmap.org/wiki/Tag:parking%3Dmulti-storey





Your edits

https://overpass-api.de/achavi/?changeset=147136655

Enjoy mapping,
eggie