Don't know but, without a better picture or someone who really knows European steam, that's going to a tough one to identify.
Something like this, maybe:
http://www.euro-trains.com/roco/temp.asp?item=63328
Or, the whole line:
http://www.euro-trains.com/roco/r_ho_steam.asp?item=lngNumericSort
Go back to the homepage and click on Trix or Marklin or Fleischmann for more steamer offerings.
I think there's a German Steamers wiki as well.
Kennedy