Panzerstadt-Linz is a Traction City that appears in A Darkling Plain. It was part of the Traktionstadtsgesellschaft orginization. It was destroyed by ODIN. The tractionists blamed it's destruction (and other cities as well) on the Green Storm, as they didn't know that the Stalker Fang was controlling ODIN.
Linz is also a real city in Austria.