Update on Deutsche Bahn strikes, according to Sunday afternoon's news:

Strikes on Deutsche Bahn start on Monday morning and will continue all week. A first warning strike is announced for Dortmund during the night. On Monday morning, Freiburg and Karlsruhe will be affected, as well as Hamburg, Erfurt and the routes via Magdeburg and Munich - Ulm - Stuttgart.
Source: www.tagesschau.de

Deutsche Bahn has installed an information hotline: 08000-996633