drt vehicles files berlin-v5.2.taxi-vehicles_0 etc. were used for drt in the hundekopf area.
Unfortunately at least in berlin-v5.2.taxi-vehicles_500.xml.gz some vehicles have start links outside the operation area.

The files were not removed in order not to compromise old scenarios or analysis.
For new hundekopf are simulations please create new files or use the newly created files in directory "drt-vehicles-hundekopf".