Hi,
it's only alpha but I present it now to you – I have set up a WMS with ProRail's milestones.
That's the GetCapabilities URL: http://michreichert.de/spoorbaanhartpunten?SERVICE=WMS&REQUEST=GetCapabi...
You have to click in JOSM on Imagery -> Imagery Preferences -> +WMS and enter to URL above. Choose image/png as image type.
There are some bugs I have to fix: - change colour of labels (Which one would you prefer?) - cut of all those decimals (reason: the shapefile stored them as doubles) - choose nicer icon instead of the black circles with blue fill @Jereon: How do they look in the Netherlands? Could you provide an image (link)?
The data source is http://data.openov.nl/prorail/20140116/20140116-spoorbaanhartpunt.zip. License: http://data.openov.nl/prorail/readme
Other issues: - Although the dataset reaches a little bit into Germany, it is not usable there. ProRail did not transform the German milestones which have DB_Ref (a Gauß-Krüger projection with Bessel ellipsoid and ETRS89 datum). That's why the have an offset mainly in east-west direction.
Please attend that this is no permission to import the milestones. The import still has to be discussed at imports list!
Best regards
Michael