hooray, I saw another Vectron. I'd never seen one until week ago, and now I've seen 4 different ones
and here is a better screengrab of yesterday's Vectrons (they have been back today as well, but never go further East than Plattling. Can't be allowed into Austria?)
http://webcam.deg.net/?a=showcam&w=showarchivimage&o=pla&id=201308271626
and I found a German website forum with discussion of Plattling webcam
http://www.1zu160.net/scripte/forum/forum_show.php?id=705957
so I put a message on there and linked to here