using the DB train on a LH flight number gives you the usual status miles (2000 in bus + exec. bonus).
currently, there is also an AIRail promotion running ("flying" STR <-> FRA by train), giving you an extra 6000 bonus miles per leg in C
Rudi, I think your are right in respect to a RTW: DB train is a (non-* A) codeshare partner and therefore probably is not eglible.