The German page for track [1] clearly states that the difference between a track and a unclassified road is in the usage. When it is used for forestry of by farmers (has to be signed as such if I understand it correctly), it's a track, no matter the surface. They do not mention "highway=service" anywhere in the text.
[1] http://wiki.openstreetmap.org/wiki/DE:Tag:highway%3Dtrack
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