looking at openptmap.org I saw a railway line, which obviously was not there. I realised, that this railway line had the attribution “proposed”. I think this railway is visible on openptmap.org only by mistake. But I did not see any mailadress to inform the author. Can anyone with more knowledge do this?
Use changeset discusions feature: https://wiki.openstreetmap.org/wiki/Changeset#Changeset_Discussions Can you post a link to the object in question?
Oops. You mean OpenPTmap.org.
Here I guess this person to be the author or at least know him/her:
It’d still be useful to post a link to the object in question.
For example, here is an area with a proposed railway line in it, just to the west of the motorway:
and here is openptmap for that area - it doesn’t show it:
Perhaps the proposed railway that you saw was tagged incorrectly?
Nothing to be seen from this line. No construction activities.
For info that is https://www.openstreetmap.org/way/258823559/history . You might want to check with the original author to see if that even belongs in OSM.