Hi,
OSM notes are public comments intended to improve the map. It's great that OpenRailwayMap consumes OSM data, and several mappers would be pleased to help with edits - however without (say) a link to ORM tag standards or what PZB is, this note isn't useful and needs to be closed.

More to the point for the pway, I understand the old Metro depot sheds are being demolished now that the new stabling is in place.
Happy Mapping,

James