Taggst du nach Karlsruher Schema?

stillgelegt heisst eigentlich "disused" es sei denn, die Gleise, Signalanlagen etc. wurden komplett abgebaut.

The coastline need not be a single closed way, as long as the parts of the coastline have no gaps (ie. the end node is the start node of the next way) and do not branch, and keep to the water-right-hand-rule.

Fähren, auch wenn sie Eisenbahnzüge transportieren, fahren nicht auf Schienen.

I just checked the coastline and found it ran CW around the island, basically marking it as water in water.
I reversed it, and it should start to show up in osmarender soon-ish.

check in JOSM (with middle mousebutton) wether there is only one coastline. check further that the coastline ways are all facing counter-clockwise around land (so that water is to the right side of the way) and then check the way is indeed closed.

There is no privatised Mapping Agency yet in Germany, but it's fun, there are lots of Geocachers, and as already said by others, there has been quite the media coverage (several TV broadcasts, big radiostations, and a *lot* of online coverage)

the "on the ground" rule of OSM discourages entering nonexistent roads.

If the road is already at construction stage there is the highway=construction tag.

ähm, jetzt sind's schon wieder 2 coastlines?

http://tile.openstreetmap.nl/coastlines.html?lat=28.22291&lon=-15.48275&zoom=11&layers=B00T
zeigt das problem sehr schön.
(ich habe allerdings schon einiges gefixt, sollte also beim nächsten durchgang besser aussehen (in ca. 2h)

Es würde extrem helfen, wenn nur eine coastline vorhanden wäre, anstatt mehreren gestapelt...

I suspect you are waiting for renderings to appear? That will take a while.
please do have a look at the FAQ.
And please use clear language when referring to GPX tracks and traced OSM ways.
Potlatch the Editor loaded by the "Edit" tab doesn't have a "save" button because you're editing live data. Commit happens on deselect. Please do read the help of that, too.

Probier einfach mal JOSM aus...
Nicht ganz trivial, aber es lohnt sich ein bisschen Einarbeitung zu investieren.

If it jumps back to the correct position, simply move it manually a tiny bit back and forth, that might save it at the correct position.

Unbedingt den Mapper fragen, woher er die info "Hutteneichweg" hat, wenn er nämlich Quellen die dem Datenbankrecht, bzw. Urheberrecht unterliegen angezapft hat, müssten seine Edits alle überprüft oder komplett gelöscht werden.

Ob per JOSM gelöscht, oder per Potlatch macht für die Undelete-Funktion von potlatch keinen Unterschied.

area=yes gehört da nicht hin.

The autorequester is currently backlogged a bit. A manual request via informationfreeway will always speed up the tile updating process, as manual requests are put into a different priority queue that is handled before the autorequest queue.

The 12 GB figure *is* a tile basically completely mapped out. however the amount of such tiles will grow in the future.
The basic bottleneck of t@h, next to the server, is the transformation from svg->png. There are simply no light-weight but sufficiently feature-complete working svg rasterizers.

no, not redundant, but more the "debug" layer, or "show me everything" layer. As a lot of Map_Features is still not rendered.
Unfortunately I'm not that well versed in db stuff so that I can work on mapnik, however I can work to make tiles@home better, so I do that.