Thanks, but I’m still only getting six nodes:

[out:xml];

{{geocodeArea:Nederland}}->.searchArea;

(
  node["amenity"="bicycle_rental"]["name"="OV-Fiets"](area.searchArea);
  way["amenity"="bicycle_rental"]["name"="OV-Fiets"](area.searchArea);
  relation["amenity"="bicycle_rental"]["name"="OV-Fiets"](area.searchArea);
);

out meta;
>;
out meta qt;

*Loaded – nodes: 6, ways: 0, relations: 0
Displayed – pois: 6, lines: 0, polygons: 0
*

Hard to believe no one in NL would be interested in contributing those important data to OSM.

Edit: Even stranger that NS seems to offer no map of the whole network:
http://www.ov-fiets.nl/huurlocaties